单项选择题

The first two paragraphs tell us a true story of ______.

A．international cooperation via the Internet
B．how dangerous thallium can be to humans
C．how one can get help from the Internet
D．the girl’s recovery from thallium poisoning

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热门试题

单项选择题The highly efficient modem communication system began ______.

A．over a century ago
B．in the middle 1960s
C．in the late 1980s
D．in the year 1980

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 Internet to come into existence.
D．If one is seriously ill, he can always get help via the modem communication system.

单项选择题The information superhighway came into existence because of ______.

A．copper wire cables
B．satellite communication
C．optical fibers
D．laser and optical fibers

单项选择题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.

单项选择题What does brainchild in the paragrapth 4 mean

A．Patent.
B．Invention.
C．Hope.
D．Pride.