单项选择题

Many people believe we are heading for environmental disaster ______ we radically change way we live.

A) but
B) although
C) unless
D) lest
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单项选择题
The little girl was so frightened that she just wouldn't ______ her grip on my arm.
A) loosen
B) remove
C) relieve
D) dismiss
单项选择题
Nancy is only a sort of______ of her husband's opinion and has no ideas of her own.
A) sample
B) reproduction
C) shadow
D) echo
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