单项选择题
A. follow the fashion B. dress up in beautiful clothes C. do more exercises D. enrich their mind
A. makes use of microwaves B. measures the movements of a spaceship by means of light beam C. makes use of sound waves D. Both A and B
A. he could not do any better B. and he could not do any better C. so he could not do any better D. but he could not do any better