It is expected that crop yields will drop,especially in underdeveloped countries,mainly because of

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• 1Each year,the world′s food reserves reduce by

  A.10 million tons.

  B.20 million tons.

  C.30 million tons.

  D.40 million tons.

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• 2The term“Green Revolution”refers to

  A.the political situation in Greenland

  B.the increased use of scientific methods in agriculture.

  C.the upheavals in the underdeveloped nations.

  D.the crop shortages experienced in 1972.

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• 3Given the present growth rate of the world′s population and our ability to produce food,

  A.the United States will be able to feed half the world by 2025.

  B.the future will see no more hunger.

  C.the developed nations will change their eating habits.

  D.we will encounter very serious problems in the near futur

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• 4How could William Nylander best be described、

  A.degenerate

  B.domineering

  C.ingenious

  D.anxious

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• 5According to accepted nineteenthcentury theories,which two elements form the composition of lichens、

  A.iodine and chemical reagents

  B.algae and fungi

  C.hypochlorite and iodine

  D.chemical reagents and atmospheric chemicals

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• 6Which 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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• 7The 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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• 8What 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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• 9Bertrand 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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• 10The 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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