单项选择题

It's reported by some scientists that physical surroundings () people's emotional reactions.

A. affect
B. infect

C. effect
D. defect

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单项选择题
The two girls look so much alike that we can hardly () one from the other.

A. separate
B. contrast
C. distinguish
D. compare
单项选择题
He was a man of noble () . He came from an old and prominent family in Virginia.

A. source
B. root

C. resource
D. origin
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