单项选择题

Hurricanes are severe cyclones with winds over seventy five miles an hour ______ originate over tropical ocean waters.

A. which
B. who
C. where
D. how
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单项选择题
The happiness of people's life can't be ______ by how much they own.
A. measured
B. examined
C. tested
D. questioned
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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