单项选择题

Hang zhou, （） we spent last spring, is one of the most beautiful cities in Chin

A. where
B. which
C. that
D. when

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单项选择题If the condor population has tripled since two decades ago, about how many are there now（）

A．90.
B．60.
C．33.
D．300.

单项选择题What is one suggestion to help save the condors（）

A．Let all condors free.
B．Don’t allow anyone to hunt.
C．Make hunters use different kinds of bullets.
D．Move the condors out of Californi