单项选择题

How many theories does the author mention

A．One
B．Two
C．Three
D．Four
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单项选择题
What causes the tension that draws water up a plant
A．Humidity
B．Plant growth
C．Root pressure
D．Evaporation
单项选择题
The passage answers which of the following questions
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
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