Analysis of test questions: setting off a fitness craze and strengthening physical exercise is a more scientific and reasonable embodiment of consumption mix, which has nothing to do with the improvement of consumption level. A is correct; D does not match the meaning of the question; For the purpose of consumption, it can be divided into subsistence consumption, development consumption and enjoyment consumption, B error; C is inconsistent with the actual consumption of Chinese residents.

Comments: This question examines students' comprehensive grasp of consumption types, consumption structure and consumption level. Starting from the topic of paying attention to physique, this paper examines students' understanding and application of these contents. It is easy to eliminate the wrong options, but it is difficult to carefully consider the A and D options.