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A. A doctor. B. A maid. C. A nurse. D. A teacher.
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单项选择题
What is the passage mainly about
A. Trees are very important to human beings.

B. Studying tree rings can tell us the history of weather and man.

C. Weather can change the history of man.

D. A tree grows best in a climate with plenty of sunlight and rainfall.
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sales engineer
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