Most of the migratory birds no longer fly across Afghanistan to Pakistan and India because
A. they change their route from time to time.
B. some birds have collapsed while flying.
C. they have been threatened by the bombs dropped on the country.
D. they are scared by the big animals in the mountains.
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The limitation of the trends method is the same as the persistence method in that ______
A. it makes predications about weather.
B. it makes predications about precipitation.
C. the weather features need to be well defined.
D. the weather features need to be constant for a long period of time.
According to the last paragraph, what are the advantages of wind power technology？
A. It can be used for different purposes.
B. It can replace nuclear power.
C. It can be in stalled in one's backyard.
D. Both A and C.
Which of the following CANNOT be inferred from the last paragraph？
A. Depleted uranium is not a kind of conventional explosives.
B. Craters are not the only damage done by bombs.
C. The conventional bombs are no less damaging to environment than the non-conventional ones.
D. Fewer people were killed in bombing in Afghanistan than in Kosovo.
These experiments all ______ that a liquid exerts an upward force on any object placed in
A. indicate
B. suggest
C. mean
D. imply
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