单项选择题

The heart is an important organ of circulation（）function is to pump blood to all parts of the body.

A. which
B. whose
C. of it
D. its

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单项选择题
（）with the size of the whole earth, the highest mountain does not seem high at all.

A. When compared
B. Compare
C. While comparing
D. Comparing
填空题
Why did the old woman have trouble in walking Because she was in ______.
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