单项选择题

Crisis would be the right term to describe the ______ in many animal species.

A．minimization
B．restriction
C．descent
D．decline
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单项选择题
Prof. White, my respected tutor, frequently reminds me to ______ myself of every chance to improve my English.
A．assure
B．inform
C．avail
D．notify
单项选择题
The city is an important railroad __ and industrial and convention center.
A．conjunction
B．network
C．junction
D．link
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