---Look! She is skiing so fast!

---It’s hard to _________ her legs were once broken.

A. imagine B. agree C. understand D. decide

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閱讀短文, 回答問題。

World Sleep Day, organized by the World Sleep Day Committee of the World Association of Sleep Medicine since 2008, is held on March 21 every year.

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In general, adults are thought to need at least eight hours of sleep a night, but a recent survey found that, on weekdays, only 21% of them really get a full eight hours of sleep, and another 21% get less than six. For teenagers, a healthy amount is about eight to nine hours per night. However, about 80% of high school students don’t get enough sleep because of their schoolwork or some bad habits.

27% of people throughout the world have sleep problems. Now there are over 80 kinds of sleep disorders, and most people know little about their danger. So, for our good life and work, it’s necessary for us to realize the importance of sleep and try to have a good sleep.

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