单项选择题

The essential function of photosynthesis in terms of plant needs is ______.

A．to derive energy from light
B．to preserve water
C．to combine carbon dioxide with water
D．to form sugars
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单项选择题
The second paragraph uses facts to develop the idea that ______.
A．a plant needs more water than is found in its composition
B．a plant efficiently utilizes most of the water it absorbs
C．the stronger the wind, the more water vapor the plant loses.
D．carbon dioxide is the essential substance needed for plant development
单项选择题
The value the student puts on correct speech habits depends on ______.
A．how closely he attends to the matter
B．whether it is English that is being taught
C．his teacher's approach to pronunciation
D．the importance normally given to grammar and spelling
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