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.
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单项选择题
Which of the following best expresses the main idea of the passage
A．It is optical fibers and lasers that have made the information superhighway possible.
B．People can communicate with each other more quickly now on the Internet.
C．It has taken quite a long time for the Intern to come into existence.
D．If one is seriously ill, he can always get help via the modem communication system.
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What of the following correctly describe Cosmos I
A．It is a 3-ft. metal pod.
B．It has eight 35-ft. metallic wings.
C．It can fly an altitude above 260 miles.
D．When it flies back to Earth, it will fall into pieces.
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