单项选择题

A．Dr. Collin.
B．A new type of fuel.
C．Spray cans.
D．A test.
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单项选择题
The crucial function of photosynthesis in terms of plant needs is______.
A．to form sugars
B．to combine carbon dioxide with water
C．to preserve water
D．to derive energy from light
单项选择题
Will the author move to the country
A．Yes, he will.
B．It is difficult to tell.
C．No, he will not.
D．He is not sure.
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