单项选择题

The human race has already paid a heavy price for its slow ______ to environmental threats.

A. response
B. responsibility
C. resolution
D. resistance
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单项选择题
To obtain a satisfactory result, one must apply two ______ of paint on a clean surface.
A. coats
B. levels
C. times
D. courses
单项选择题
A large part of a person's memory is ______ words and combination of words.
A. by means of
B. in terms of
C. in connection with
D. by way of
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