单项选择题

In solving the diffieuhy, what really () is our courage and spirit.

A. senses
B. requires
C. needs
D. counts

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单项选择题
Tom gets along well with me though he is my () in rank.

A. superior
B. colleague
C. superman
D. junior
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
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