单项选择题

A．The birds won’t learn to keep away from people.
B．She might change her major.
C．There are more endangered species in zoos than in the wild.
D．She wasn’t quite ready to come back to campus.
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单项选择题
A．He told Bob not to study late at night.B．He had often advised Bob to study.C．Bob is too tired to study any more.D．Bob didn’t hear the alarm.
A．He told Bob not to study late at night.
B．He had often advised Bob to study.
C．Bob is too tired to study any more.
D．Bob didn’t hear the alarm.
单项选择题
We learn from the third paragraph that ______.
A．London was plagued with rats in the 1950s
B．London is covered with smog today
C．London was polluted by smog in the 1950s
D．Los Angeles is as heavily polluted today as London was in the 1950s
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