Turn the bottle to empty it before you fill it with something.A. back and forth B. up and down C. upside down D. now and then 题目和参考答案——青夏教育精英家教网—

题目内容

( ) 10. Turn the bottle to empty it before you fill it with something.

A. back and forth B. up and down C. upside down D. now and then

10. C考查词组的用法。back and forth来回地;up and down上下地，到处；upside down上下颠倒； now and then时不时地。句意：把瓶子倒过来倒空，然后再装进别的东西。

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For the study，researchers at the Albert Einstein College of Medicine in New York selected 34 adults，men and women. All of the volunteers had played soccer since childhood and now competed year-round in adult soccer leagues. Each filled out a detailed questionnaire developed especially for this study to determine how many times they had headed a soccer ball in the previous year,as well as whether they had experienced any known concussions(脑震荡) in the past.

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