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They have to work at once, _______?

A. can they B. can’t they C. don’t they D. haven’t they

C 【解析】句意:他們必須馬上工作,不是嗎?反義疑問句,前面是肯定句,后面是否定形式,have to 是一般現在時,用助動詞don’t。故此處為don’t they,故選C。
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Firstly, to play sports safely in hot weather, you must drink water. Sports drinks are great for athletes, but they have so much sugar that they’ll dehydrate(使脫水)you more. However, drinking a

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How to keep 1.when playing sports in summer

Facts

? Some people do exercise 2. in the sun for long in hot summer.

? Some sports players are sent to hospitals because the3.is too high.

4.

? Drink water and play sports safely. But too many bottles of sports drinks may do

5.to you.

? Take enough 6. during summer exercise. When you feel uncomfortable, let your coach know right now.

7.sit in the sun when you have a rest. You’d better sit under a tree or go indoors for a while, which may help you keep active longer.

? Choose a proper time for practice. Remember to exercise as8. as possible to enjoy exercising on cool summer mornings. Sunset is a good choice as well.

? Be careful with your9.and have a balanced diet.

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