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

试卷相关题目

• 1The 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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• 2Bertrand 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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• 3What principles most influenced scientitic thought for two thousand years、

  A.the speculations of Thales.

  B.the forces of electricity,magnetism,and gravity.

  C.Aristotle′s natural science.

  D.Galileo′s discoveries

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• 4The aim of controlled scientific experiments is _____

  A.to explain why things happen.

  B.to explain how things happen.

  C.to describe selfevident principles.

  D.to support Aristotelian scienc

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• 5Which of the following is true、

  A.Green Revolution did not end until 1972.

  B.The shortage of chemical fertilizers was caused by the short supply of petroleum.

  C.Every ton of petroleumbased fertilizers can help increase ten tons of crop yields.

  D.By the year of 2025,one million children will die of hunger each month in the world.

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• 6The worst hazard for spacemen is

  A.meteors.

  B.heat.

  C.radiation.

  D.gas.

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• 7Scientists 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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• 8The spacemen were worried about solar flares when they were

  A.crossing the Van Allen belts.

  B.setting up a moon base.

  C.exploring the surface of the moon.

  D.waiting in the command modul

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• 9When 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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• 10Which 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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