1. 1 What is sports?
Lesson 65438
I.1.d2.c3.a4.d2.1.× 2.× 3. √
3. 1. Linear motion curve motion of spatial positioning machinery II. Transformation movement, life movement
3. Mechanical machinery life thermoluminescence (or chemical movement) machinery
second kind
I. 1.b2.b 2, 1.×2.×3 .*
Three, 1. Floating white clouds (mechanical movement) Birds fly over (mechanical movement) Children chase (mechanical movement) Windy (mechanical movement) Drifting (mechanical movement) 2. Robot life 3. Density air buoyancy thermal motion mechanical motion
(1) mechanical movement (2) In the same time, for example, a month or even longer, the length of nail growth and the distance of land movement are accurately measured respectively, and then compared.
1.2 moving or stationary
Lesson 65438
I. 1. C2.D3.D4.C5.D2， 1.× 2。 √ 3.× 4.× 5.√.
Three, 1. Motion, static motion, static motion II. Static motion 3. Static motion 4. Bus no.5. Ground carriage 6. Static motion, static.
4. 1. That's right, because the reference object can be chosen at will. (Example omitted)
This is an open question, as long as it is meaningful.
second kind
I. 1.d2.a3.b4.d5.c
2. 1. Ground motion 2. Clouds and the sun 3. The driver tumbled 4. The moon's rotation period is the same as its rotation period around the earth.
Three, 1. Three students have reason, because they chose different reference objects. A take the ground as a reference; Second, take another faster train in the same direction. And student c takes himself as a reference.
2. As long as you can answer relatively static conditions and applications.
1.3 fast or slow
Lesson 65438
I.1.d2.b3.c4.c5.c6.c7.c8.a.
1. Analysis: When measuring the length of an object with a scale with a minimum scale of 1 mm, it must be accurate to mm, and one digit below mm needs to be estimated. So to judge whether the data is correct, we can see whether the penultimate bit of this data is the smallest mm bit. If it is, it is correct; If not, it is wrong. ∵ 1.8 dm The second last place is dm. 18.2cm inversion
The second digit of the number is cm. 182.34 mm The penultimate position is below mm, and the above data are incorrect. Only the penultimate position 182. 3 mm is mm, so option C is correct. Answer: c
Two. 1 .× 2 .× 3 .× 4.√ 5 .×
Three. 1.4.20 2mm 2. (1) decimeter (2) millimeter (3) centimeter (4) cubic meter. The average value after repeated measurement is 3.72 4. 15.8 5. 105.
4. 1. Analysis: A piece of paper is so thin that it is impossible to directly measure its thickness in millimeters. Therefore, a special measurement method must be adopted, that is, the "accumulation method" is used to stack the same paper to make it have enough thickness, which can be measured by the scale of millimeters, and then the thickness of a paper can be indirectly measured by dividing the total thickness by the number of sheets.
Experimental steps:
(1) You can take science textbooks P 1 to P 178, stack them up and press them hard; (2) measure the total thickness with a millimeter scale;
(3) Divide the measured total thickness by the number of sheets of paper 89 to obtain the thickness of a sheet of paper.
2 . h = h 1+H2+H3+H4 4 = 13.8 1cm+ 13.82cm+ 13.80cm+ 13.83cm 4 = 13.8 15cm h = 13.82cm .
2 class hours
I. 1.a2.a3.c4.d
Second, 1. The speed of the distance traveled per unit time is V S T V = S/T 2. ( 1)= 3.6km/h(2) 1.25 1.5× 10-3 14.4 3。
Third, 1. The uniform crawling speed of B boy A is 0.5m/s2.2.5h.
The third category
I./kloc-0 1.C2.B3.A4.D
Second, 1. The average speed of uniform linear motion at any time or any position. 2.( 1) Scale of stopwatch (2) BCBC BCBC BCBC minus 3. 1: 6.
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Two complete answers in the seventh grade new science classroom! top
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Seven answers to the new science class
4. Driving time V = ST 5.20 18 27.2
Three. 1.0.5m/s1.25m /S4 m /S2. ( 1) 18min 8min 13.5h(2)95:4km/h。
Category 4
I. 1.b2.c3.c4.d
Second, 1.vt s/v unified 2.3×105km/s3.6.9×105km4.766.7s.
Three. 1. 1080 m2 . t = SV = 12km 40k m/h = 0.3h = 18min。
A volume of scientific quality evaluation questions
One,
Topic 1 2 3 4 5 6 7 8
Answer A B B B A B B C
Two. 1.× 2.√ 3.√ 4.× 5.×
3. 1. 1 mm 1 cm2 100 636 3. Reference 4 for position change. Trees on the roadside or trains or passengers on the ground 5.1mm6.644 4.8 7.20188.dm0: 22h9. Time travel distance travel time 65433. S meters kilometers per second/hour 1 1. +0. Static motion 12. Km mm m/s
Four. 1 . v = s/t = 1200m/ 1min = 1200m/60s = 20m/s。
2.5400 3000 3. Train crossing time: t = ST = 980+200m10m/s =118s.
1.In the relay race, students who receive the baton should accelerate in the same direction. When two students are at the same speed, that is, relatively still, the baton will not go wrong. 2.( 1)3 m/s (2)3 minutes 3.33 m/s 0. 78 m/s 2 m/s
Scientific quality assessment volume b
One,
Theme 1 2 3 4 5 6 7 8 9
Answer A D B B D C B B B b B B
Ii. 1.200 720 2. Still 3. A car. 8cm/s10cm/s8.8cm/s5.480.
1000 16.67 6. Train 300 7. C analysis: A, B and C each take themselves as reference objects, that is, they assume that they are stationary objects in advance to observe the movements of the other two cars. A sees that B's car is stationary, but it comes to the conclusion that B moves as fast as A. When B sees that C's car is far away from him and C sees A's car backing up, it can be concluded that C's car is in front of A's car, so it moves fastest. Of course, the above two judgments are based on the ground as a reference, and the results are obtained. 8. 17.49 9.2.5 10. "Still" or "driving to the left" or "still" or "driving to the left" has different reference objects 1 1. B move the same distance. The comparative exercise time is 12. Km/s > m/s > km/h > m/min 13.20 20 14. (VL x v2)/22v 1 v2/(v 1+v2)。
Three. 1.(1) v = 36 km/h t' = 0.45 h = 27 min (2) When driving at the lowest speed limit v2=60 km/h,
T2 = s/v2 = 3h. When the maximum speed limit of V2 is' = 120km, T2' = s/v2' = 1.5h is 1.5=3 h.
2 . t = s v = 6m 2m/s = 2s 30m 3 . 0 . 1h 1800m
4.1.6S4.17m/s50s3m/s is greater than 2. V = T (1) smaller (2) larger.
3. Because, although A retreated 10 m from the starting line, A ran very fast after the start. At the same time, A runs 50 meters, B runs 40 meters, and finally everyone has to run 10 meters. This is the 10 meter sprint. A runs fast, but in the end, A must reach the finish line first.
4. Let the motorboat speed be V, and the current speed be V (and V >；; V), the distance is S. Time to go back and forth in still water t= 2s v ① In flowing water, time to downstream t 1= s v+v, time to upstream t2 = sv-v.
Total round-trip time t1+t2 = SV+V+SV-V.
= 2sv v2—v2
= 2s v( 1—t=v2 /v2)
=2s v. 1 1—(v2/v2) ②
Comparing ① and ②, we can know that (t 1 T2) > t means that the time in still water is shorter than that in running water.
2 force
2. 1 the role of force
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Three complete answers in the seventh grade new science classroom! top
Lesson 65438
I.1.b2.c3.a. 1.× 2.√ 3.×
Three. 1. Motion state of mutual shapes of objects 2. Gravitational earth 3. Four feet. neglect
second kind
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Three New Science Classroom Seven Answers
I.1.d2.b3.b4.b2.1.× 2.× 3. *
Three. 1. Niu Li pulls the grounding spring dynamometer 4 again. Within the elastic range of the spring, the length of the spring extension is proportional to the tension. Fourth, prevent the hook of the spring dynamometer from getting stuck in the housing.
Verb (abbreviation of verb) (50g/l0g) × 2cm =10cm25cm-10cm =15cm.
The third category
1. 1.d2.c 2。 1.x2.x3.x。
Three. 1. Point of action in dimension direction 2. Direction and action point. 1. Omit 2. Omit 3. Omit.
2.2 under the action of gravity
I./kloc-0 1.a2.a3.b4.c5.a
Two. 1.× 2 .× 3.√ 4 .× 5.√ 6.√
Third, 1. The attraction of the earth is cattle. The earth is vertically downward. 2. The gravity of an object is directly proportional to its mass kg n..
9.8 N/kg 9。 8 Newton The gravity of an object weighing kg 1 kg is 9.8 N3. The direction of vertical and horizontal gravity is always vertical downward. The gravity earth is vertically downward. 588 N70 KG 6。 486 N7。 The motion state of throwing the center of gravity vertically downward.
5.( 1) The gravity on an object is directly proportional to its mass.
(2)① Wuhan and Shanghai; ② Equator and North Pole; ③ Different latitudes.
Six, spring dynamometer, thermometer put forward to guess the iron temperature is constant, the position is unchanged, the iron is hung on the spring scale and weighed by gravity, and the iron is heated on the alcohol lamp, and then the results of two gravity comparisons are weighed.
2.3 Is there a similarity between motion and stillness?
I.1.b2.d3.d4.c5.d6.d7.c8.c9.d10.b.
Two. 1.× 2 .× 3.√ 4 .× 5 .× 6 .×
3. 1. Static uniform linear motion equilibrium state equilibrium force A pair of equilibrium forces 2. Equal but opposite 3. 15N4. 196 N pull 196 N vertical upward rope 5.3x105n is equal to or equal to 6.0N7. The change force of the vertical downward center earth speed with the weight of 39.2N is the reason for changing the motion state of the object 2.
Fourth, 1.
Verb (abbreviation of verb) solution: m = PV = 7.9×103kg/m3× 0.5m3 = 3.95×103kg.
g = mg = 3.95kg×9.8N/kg = 3.97 1× 104N
∵3.97 1× 104N & lt； 4 × 104N ∴ can be lifted.
6.( 1) The number of paper clips hanging under the umbrella (or the area of plastic film) (2) The number increases and the falling time decreases; When the quantity decreases, the falling time increases (when the area of plastic film increases, the falling time increases; The area of plastic film is reduced, and the falling time is reduced) (3) Different experimental schemes can be designed. (Measuring time or comparing with each other) As long as the selected equipment is consistent with the designed experimental scheme, ① Different numbers of paper clips (or parachutes with different film areas) and stopwatches (or other timing tools) ② Scheme 1: Directly measure the parachute falling time. The experimental steps are as follows: a) release any parachute from the balcony and measure its falling time t1; B) Repeat the experiment by changing parachutes (different number of paper clips or different film pasting area), measure the falling time t2, and compare the size of t 1 and t2.
Scheme 2: Two different parachutes (with different numbers of paper clips or different membrane areas) fall from the same height at the same time, and the landing sequence is compared, and the experimental steps are omitted.
2.4 Friction and us
I . 1 . C2 . C3 . D4 . C5 . B6 .( 1)D(2)A，B (3)C 7。 b，c。
8.C 9。 A 10。 B
Two. 1.× 2.√ 3 .× 4 .× 5 .× 6.√
3. 1. Rolling and sliding static 2. Increase the pressure and increase the friction 3. 100 N Slow down horizontally and move in a straight line to the left 100 N Keep the original speed and move in a straight line at a constant speed 4. Smooth contact 5.234.
6. Uniform straight line 3. 5 The balancing force moves along a uniform straight line 7. Equal to or greater than 8. Reducing the pressure makes the contact surface smooth, rolling instead of sliding increases the pressure and increases the roughness of the contact surface. Fourth, ellipsis
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4 complete seven-year science new classroom answers! top
When sprinters start, they should push back with the greatest strength, so as to get a relatively high speed in the shortest time. If you wear ordinary sports shoes, the back pedal force is greater than the maximum static friction between the sole and the runway, and the athlete's feet will slip and move backwards, which will affect the competition results.
6.( 1) When the roughness of the contact surface is the same, the greater the pressure, the greater the friction.
(2) 2 and 3, when the pressure is the same, the rougher the contact surface, the greater the friction. (3) Control variable method.
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Four new science classroom seven answers
2.5 can't move or stop.
Lesson 65438
1. 1.b2.d3.c4.b5.b2， 1.x2.√ 3.× 4.× 5。 √ 3, 1. Move on. 2. Being at rest and doing linear motion without external force. 3. Roll back and roll forward during the break.
(2) The less resistance the car receives, the longer the car moves.
(3) If the car moves on an absolutely smooth horizontal plane, that is, it is not affected by resistance, then the car will always move in a straight line.
2.( 1) Stones thrown by people always deviate from the throwing direction and fall back to the ground.
(2) When the speed of throwing the object is large enough, the object will leave the earth and make a circular motion around the earth.
(3) artificial earth satellite
second kind
I.1.c2.c3.d4.a5.c6.a.ii. 1.× 2.× 3.√4.×5.√
3. 1. The vertical inertia is affected by gravity 2. Any stationary uniform linear motion. a，B，D 4。 A static state or a state of uniform linear motion is an inherent static motion 5. After that, the inertia of the stationary object is 6. Inertia
4. 1.( 1) Fly out without moving (2) A. Overcome inertia, B. No inertia, C. Suffer inertia. (3) Force, change and inertia. 2.( 1) Speed and ground conditions. (2) Don't drive too fast in rainy and snowy weather, but slow down.
3. (omitted) 4. (omitted)
Scientific quality assessment volume a
One,
Topic 1 2 3 4 5 6 7 8 9 10
Answer D D D B A C D C D C D C D C D C D C D C
Topic11213141516171819 20.
Answer D A C D C D D D C A
Two. 1.√ 2.× 3.√ 4.× 5.× 6.× 7.√ 8.× 9.× 10.√
3. 1. Interform 2. Weight 4. 9 Earth 3. Effect of action point in size direction 4. Pressure friction 5. Inertia 6. Equal in magnitude and opposite in direction act on the same straight line 7. A reasonable answer can be omitted from 4.
Verb (abbreviation of verb) 1.( 1) Speed (2) Resistance (friction) never stops moving (doing uniform linear motion) Newton first (3) Same car, same slope, same height, different surfaces 2.
Scientific quality assessment volume b
One,
Topic 1 2 3 4 5 6 7 8 9 10
Answer D B A A B C D A B D b d
Topic11213141516171819 20.
Answer d b d d d d d d b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b
Two. 1.√ 2.× 3.× 4.× 5.√ 6.× 7.× 8.√ 9.× 10.×
Three. 1. action point size direction action point 2. 10 10 10 becomes smaller by 3. Gravity motion state 4. Whether perpendicular to the direction of gravity or vertical downward 5. Reduce and increase 6.5N
7.6× 104 six×104 four. neglect
5. 1.( 1) 9.8 is directly proportional to 29. 4N (2) The horizontal low gravity direction is vertical downward (3) the center of gravity.
2.( 1) Because the pulling force of the spring dynamometer on the wood block and the friction force of the wood block are a pair of balanced forces.
(2) B (3) Place the cuboid block on the horizontal long wooden board, and use the spring dynamometer to pull the block to slide along a straight line at a uniform speed, and compare the readings of the spring dynamometer in step 4 and step 1. (4) Omission
3 Cloudy to sunny, cold and warm
3. 1 weather change
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5 complete seven-year science new classroom answers! top
Lesson 65438
I.1.c2.b3.a.ii. 1.√ 2 .× 3.√ 4.√ 5 .×
3. 1. Short-term movement changes 2. Cloud 3. Heat, frost, drought and flood, storm and hail. Thunderstorms don't cross the river.
Four. 1.( 1) southeast wind, cold wave and heavy snow (2) military life traffic (2) (1) c (2) a.
second kind
I. 1.b2.d3.c4.c5.d6.d
Two. 1 .× 2 .× 3 .× 4 .× 5 .× 6 .×
Third, 1. ℃; 7 1 2. High altitude ground observation. The wind force is 0 ~ 1 2 4. Temperature, humidity, precipitation evaporation, wind and clouds. ① Observe the temperature in the louver four times a day at 2, 8, 14 and 20: 00 Beijing time. Observe the wind direction with anemometer and measure the wind speed with wind cup.
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Seven answers to the new science classroom
(3) The rain gauge measures the precipitation, and the rainwater or snowmelt water collected in the water storage bottle in a certain period is poured into a graduated measuring cup, which is the precipitation in this period.
( 1)2 1.7℃; 22.0℃ (2) high; The louver box can avoid direct sunlight, and the box is painted white, which can better reflect sunlight. Directly exposed to sunlight outside the box, the temperature is higher (3) outside the louver box.
3.2 Weather forecast
Lesson 65438
I.1.a2.a3.b4.d5.d6.c7.b8.d.
2. 1 .× 2 .× 3 × 4.√ 5 .× 6 ×.
Three. 1. Earth's atmosphere 2. Rain, sunshine, wind, temperature and precipitation. Satellite cloud pictures of meteorological observation data iv. Sun-synchronous orbit meteorological satellite Earth-synchronous orbit meteorological satellite Global medium, long and short term 5.3
Fourth, 1. European Atomic Energy Agency
2.( 1) The maximum temperature is 0℃ and the minimum temperature is 1 9℃. It turns sunny to cloudy during the day, with light rain at night, and the northwest wind is 4. (2) The highest temperature12℃, the lowest temperature 10℃, moderate rain during the day, moderate rain at night, and north wind level 4.
(3)
second kind
I.1.d2.b3.d4.a5.c6.a.ii. 1.× 2.× 3.√ 4.× 5.√.
Three. 1. Type, quantity, concentration and duration, air pollution index 2. The smaller the five, the smaller the three. Industrial waste gas, automobile waste gas. Nitrogen oxides, sulfur dioxide, inhalable particulate matter 5. Focus.
Four. 1.( 1) SO2 inhalable particulate matter (2) > 300 5 Reduce outdoor activities (3) Prohibit setting off fireworks and firecrackers 2. (1) See the article Man-made Disasters Caused by Industry. (2) Protect the environment, especially the atmospheric environment, and control air pollution.
3.3 Weather control
I./kloc-0 1.A2.D3.D4.D5.D6.C7.D
Two. 1 .× 2 .× 3 .× 4.√ 5 .× 6.√
Three, 1. The water vapor in the air reaches saturation, and there are condensation nuclei when the temperature drops. 2. Descending condensation. 3.DCabe。 4. Refrigerant condensation nuclei. 5. Powerful shock wave. 6. Cooling is beneficial to the condensation of water vapor.
The energy of the weather process is enormous. 2. Soil cannon and artillery hail suppression, 1946.
3.4 Climate
Lesson 65438
1. 1.d2.d3.a4.c5.c 2。 1.× 2.× 3.× 4.√ 5.√.
3. 1. Weather and climate. The climate is long 3. Temperature 4. Weather and climate. The south of China is a place where human activities are concentrated, and the impact of climate anomalies is great. There are few human activities in desert areas, and the impact of climate is small.
4. 1. Omit. 2. Climate characteristics of Shanghai: high temperature and more precipitation in summer, low temperature and less precipitation in winter, with both rain and heat. Compared with Shanghai, Wuhan is hotter in summer and colder in winter. This is because Shanghai is located in the eastern coastal area, which is more affected by the ocean than Wuhan in the inland area of central China, so the temperature changes little.
second kind
I./kloc-0 1.C2.B3.B4.C5.A6.C
Second, 1. (1) low (2) ocean current factor, warm current and cold current 2. Topographic factors, land and marine factors
Three. L. Climate, precipitation and temperature
The latitudes of Harbin and Guangzhou are different. Guangzhou is located in a low latitude area and receives a lot of solar radiation energy.
3.5 Climate in China
Lesson 65438
I. 1. A2。 C3 D4 . a5 . C2， 1 .× 2 .× 3 .× 4。 √ 5 .× 6.√
3. 1. Less rain, low cold wave, frosty sandstorm 2. Fast high low pressure and high pressure summer monsoon 3. Monsoon zone 4. Eurasian Pacific monsoon climate. Southeast coast, northwest inland.
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6 complete seven-year science new classroom answers! top
4, 1. The dividing line is Daxinganling-Yinshan-Helan Mountain-Bayan Kara-Gangdise Mountain 2. Omit 3. The Pacific Ocean is warm and humid, while the Asian continent is cold and dry. Southwest of China, middle and lower reaches of Yangtze River, east.
5, 1.4, 5 south coast 2.7, 8 north middle and lower reaches of the Yangtze River, summer drought and meiyu 3. front
second kind
I. 1.C2.B3.A4.B5.B6.C II. 1.× 2.× 3.√ 4.√ 5.√.
Third, 1. Reduce the factors of large latitude. Second, reduce the factors of low altitude. Third, it decreases from the southeast coast to the northwest inland. Iv. Tropical Monsoon Climate Subtropical Monsoon Climate Temperate Monsoon Climate Leng Xia is hot in winter and dry and rainy all year round.
Four. 1. The climate difference between east and west. 2. Animal husbandry and planting. 3. Rich in tourism resources and mineral resources.
4. Tip: Think about clothing, food, housing, etc.
Scientific quality assessment volume a
One,
Topic 1 2 3 4 5 6 7 8 9 10
Answer B D D C C A C B A C
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Seven answers to the new science classroom
Topic11213141516171819 20.
Answer a, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b, b. B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B B
Two. 1.√ 2.√ 3.√ 4.× 5.× 6.√ 7.× 8.×
3. 1. Multi-year change of short heating and short cooling 2. Observation and measurement, high altitude observation, ground observation 3. Water vapor in the clouds. Southeast monsoon, southwest monsoon, peaceful India 5. Animal husbandry and planting, dry rice planting 6. Vertical.
Four. 1. sunny (2) southwest wind (3 )8 20 12
2.( 1) North-South (or Northwest) (2) Roof A is steep and Roof B is flat. (3) There is a lot of precipitation, and the roof slope is large, which is convenient for rainwater flow. In the second place, there is less precipitation, and the flat roof saves materials.
3.( 1) A (2) Northern Qinghai-Tibet Plateau (3) DEEC (4) Spring drought and summer drought (5) Affected by the summer monsoon, the precipitation gradually decreases from the southeast coast to the northwest inland, and the annual precipitation is concentrated in summer. The advance and retreat of the summer monsoon determines the beginning and end of the rainy season in the eastern region. The abnormal laws of summer monsoon advance and retreat often cause drought and flood disasters.
4.( 1) The global surface temperature is rising and the climate is warming. (2) It has affected the physical and biological systems in many parts of the world, and at the same time caused serious heat waves, floods and increasing extreme weather events in many places, resulting in significant property and life losses. (3) Including natural causes and man-made causes. Natural causes are mainly solar radiation changes and volcanic eruptions. The influence of human activities has led to global warming to a great extent (4) such as artificial afforestation, building reservoirs, making the local climate mild and humid, using environmentally friendly energy, reducing carbon dioxide emissions, etc.
Scientific quality assessment volume b
One,
Topic 1 2 3 4 5 6 7 8 9 10
Answer bb bb bb bb bb
Topic11213141516171819 20.
Answer A A A C D B B C D A
2. 1. Tropical desert climate and subtropical monsoon climate. Condensed nuclear cloud with strong refrigerant hygroscopicity. North and South 4. Summer monsoon of Helan Mountain in Daxinganling. North-South Summer Monsoon 6. Tropical monsoon subtropical monsoon temperate monsoon temperate continental mountains 7. Burning Liao Toksun Mohe Turpan Wuhan, Nanjing, Chongqing 8. Southeast monsoon, southwest monsoon, east, west, south and south China.
Three. 1.( 1) Pollution caused by the building itself; Pollution caused by decoration; Furniture pollution (2)
2.( 1) Low temperature in high terrain (2) High temperature in low latitude (3) Natural disasters are harmful to human beings, otherwise they are only natural phenomena and cannot be disasters. The losses caused by the same level of disasters in densely populated or economically developed areas are much greater than those in sparsely populated or economically backward areas (4) E C.
3.( 1) Omit (2)43.4℃ (3) 745 mm (4)7 1 North 3 summer and autumn.