单选题：Scientists study how photosynthesis works because they want

题目分类：理工类
题目类型：单选题
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题目内容：

Scientists study how photosynthesis works because they want to__________. A．improve the efficiency of it
B．turn plant sugars to a new form of energy
C．make green plants a new source of energy
D．get more sugars and starches from plants

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