单项选择题

A. 14 years.
B. 28 years.
C. 7 years.
D. 21 years.
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单项选择题
How does the weather affect the growth of a tree
A. Plenty of sunlight and rainfall will limit the growth of a tree.

B. A tree grows best with little sunlight and rain.

C. Some trees provide an exact record of the weather.

D. The weather determined the pattern of rings in a tree trunk.
填空题
Night (fall) ______ , all the children playing in the park hurried home.
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