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
A growing plant needs water for all of the following except ______.
A．forming sugars
B．sustaining actively growing parts as well as woody stems
C．absorbing mineral elements
D．taking in carbon dioxide from the air
单项选择题
What does the author actually say about pronouncing foreign languages
A．There are not many people who are even fairly good.
B．Nobody is really an expert in the skill.
C．There are even some people who are moderately proficient.
D．Only a few people are really proficient.
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