单项选择题

Research shows that this pesticide is so()that it can kill the insects in a few seconds.

A. powerful
B. influential
C. monstrous
D. vigorous

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单项选择题
I have a habit of stopping()to look up the dictionary while reading.

A. occasionally
B. simultaneously
C. eventually
D. directly
单项选择题
The native Canadians lived in()with nature, for they respected nature as a provider of life.

A. coordination
B. acquaintance
C. contact
D. harmony
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