单选题：Scientistspayspecialattentiontothestudyofplantsbecause______

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题目内容：
Scientistspayspecialattentiontothestudyofplantsbecause_______. A．theycanprovetheclimatechangeclearly
B．theyareveryimportantinthefoodchains
C．theyplayaleadingroleinreducingglobalwarming
D．theyaregrowingandfloweringmuchfasterthanbefore
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Atschool,somestudentsareactive______someareshy,yettheycanbegoodfriendswithoneano

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请在第___54____处填上正确答案。

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