单项选择题

________has contributed most to the redwoods survival.

A．Absence of natural enemies
B．Resistant bark and damp climate
C．Coastal isolation
D．Cool weather and daily fog
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单项选择题
Weeks ______ before anyone was arrested in connection with the bank robbery.
A．elapsed
B．expired
C．overlapped
D．terminated
单项选择题
A．running fromB．jumping offC．stepping offD．keeping from
A．running from
B．jumping off
C．stepping off
D．keeping from
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