How many theories does the author mention? The passage answers which of the following questions?

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问题 How many theories does the author mention?
The passage answers which of the following questions?

选项 A、What is the effect of atmospheric pressure on foliage?
B、When do dead cells harm plant growth?
C、How does water get to the tops growth?
D、Why is root pressure weak?

答案C

解析
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