单项选择题
The human beings have polluted the environment seriously. It is time the United Nations
must take
some measures.
A. take
B. taking
C. to take
D. took
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单项选择题
Any troop of wild animals should be approached warily.()
A. fearlessly
B. confidently
C. silently
D. prudently
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单项选择题
The people of China are working very hard to make concerted efforts to invigorate the country.
A．enjoyable
B．persistent
C．encouraged
D．joint
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in。
or。
from。
to。
on。