单项选择题

Our earth is full of sound because it is full of () like trucks rolling along the highway or jets climbing into the sky.

A. travel
B. motion
C. construction
D. excitement

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单项选择题
Eggs, though good to health, have()of fat content.

A. large number
B. a large number
C. a high number
D. a high amount
单项选择题
Our teacher had us()a report on our investigation of the case.

A. write
B. to writing
C. to write
D. written
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