The spacemen were worried about solar flares when they were

试卷相关题目

• 1Scientists have fixed a safety level of

  A.10 rems per year.

  B.60 rems per year.

  C.100 millirems per year.

  D.5 rems per hour.

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• 2The worst hazard for spacemen is

  A.meteors.

  B.heat.

  C.radiation.

  D.gas.

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• 3In sentense 2,“speculated on”(line 4)means

  A.suspected

  B.expected

  C.engaged in buying and selling

  D.considered

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• 4The passage says that until recently scientists disagreed with the idea _____ .

  A.that there are mysterious forces in the universe.

  B.that man cannot discover what forces“really” are.

  C.that there are selfevident principles.

  D.that we can discover why things behave as they do.

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• 5Bertrand Russell′s notion about electricity is _____ .

  A.disapproved of by most modern scientists.

  B.in agreement with Aristotle′s theory of selfevident principles.

  C.in agreement with scientific investigation directed toward“how”things happen.

  D.in agreement with sientific investigation directed toward “why” things happen.

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• 6When men spend long periods in space how will they protect themselves、

  A.By taking special drugs.

  B.By wearing special suits.

  C.By using a protective blanket.

  D.No solution has been found yet.

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• 7Which of the following is true、

  A.The grandchildren of astronauts are deformed.

  B.The children of astronauts have damaged sex organs.

  C.Radiation damage may show only in later generations.

  D.Radiation does not seem to be very harmful.

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