A．is often quoted in the work of other scientists
B．is careful not to make a value judgement about the use of data
C．is applauded by all distinguished experimentalists
D．generates a novel and well-founded generalization

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

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

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.

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

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.

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

A．Most scientists are confident that the spacecraft will work well.
B．A more ambitious orbital flight will follow this mission.
C．The author is quite sure that this mission will make impossible technologies seem possible.
D．The key of the engineering of Cosmos I is building wings that can open and pivot.

A．Sunlight.
B．Nuclear.
C．Wind.
D．Electricity.

A．He remained in the saddle for several minutes spellbound.
B．He immediately jumped down and went forward.
C．He waited until his bed was ready and then dismounted.
D．He rode to the mound and stared at the structure before him.