单项选择题
A. Small companies. B. Industrialists. C. Trade unions. D. The younger generation.
A. He lost a button at work. B. He doesn’t know where he put the calculator. C. He thinks he broke something the woman lent him. D. He’s not sure how to solve the math problem.
A. it makes us sleepy B. it causes sleep loss C. it increases our appetite D. it results from lack of sleep