A. High calorie food

B. High-fat food

C. High fiber food

D. High-sugar food

Answer: c

2. Which of the following is an effective way to keep mental health?

A. overwork

B. Ignoring sleep

C. Keep exercising

D. don't associate with others

Answer: c

3. Which of the following foods contains a lot of vitamin C?

A. milk

B. meat

C. Citrus fruits

D. bread

Answer: c

4. Which of the following diseases can usually be prevented by exercise?

A. premature aging

B. Diabetes

C.caught a cold

D. Obesity

Answer: d

5. Which of the following fruits is often called "brain food"?

A. bananas

B. apples

C. watermelon

D. grapes

A: A.