单项选择题

According to the conversation, the use of fossil fuels ______.

A．should be banned in order to save energy
B．brings some side effects
C．causes the earth ‘s temperature rise
D．should not be blamed for the pollution of environment
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单项选择题
According to some estimates, at most for how long can we use the fossil fuel reserves
A．20-50 years.
B．50-100 years.
C．100-120 years.
D．200-500 years.
单项选择题
Which of the following statement about William Perrey is NOT true
A．He is very concerned about the North Korea’s nuclear program.
B．He favors aggressive diplomacy to resolve the crisis.
C．He thinks US troops should continue to join UN peace-keeping missions.
D．He thinks large American units should not remain under US command.
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