According to the passage what problem does the recent research find?A.Sleep shortage has

外语类 已帮助 人

According to the passage, what problem does the recent research find?

A.Sleep shortage has become a worldwide problem.

B.Developed nations don"t pay enough attention to sleep.

C.Sleep problems are more serious in developing countries.

D.Lack of sleep is more obvious in developed countries.

请帮忙给出正确答案和分析,谢谢!

热搜:medline数据库中to字段是表示非英文文献的原文题名