What is the message the author wants to convey in the passage、

试卷相关题目

• 1The reduction of the possible hazards in food ultimately depends on ________.

  A.the government

  B.the consumer

  C.the processor

  D.the grower

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• 2By saying “they employ chemical warfare” (Line 4, Par

  A.2), Bruce Ames means “________”.A.plants produce certain chemicals to combat pests and diseases

  B.plants absorb useful chemicals to promote their growth

  C.farmers use man-made chemicals to dissolve the natural chemicals in plants

  D.farmers use chemicals to protect plants against pests and diseases

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• 3The author considers it impossible to obtain no-risk food because ________.

  A.no food is free from pollution in the environment

  B.pesticides are widely used in agriculture

  C.many vegetables contain dangerous natural chemicals

  D.almost all foods have additives

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• 4What does the author think of the Americans’ view of their food、

  A.They overstate the government’s interference with the food industry.

  B.They are overoptimistic about the safety of their food.

  C.They overestimate the hazards of their foo

  D.D.They overlook the risks of the food they eat.

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• 5                                       Passage ThereQuestions 17 to 20 are based on the passage you have just heard.

  A.They will be much bigger.

  B.They will have more seats.

  C.They will have three wheels.

  D.They will need intelligent drivers.

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• 6Which of the following titles is most appropriate to the passage、

  A.Polarity Reversal: A Fantastic Phenomenon of Nature.

  B.Measurement of the Earth’s Magnetic-Field Intensity.

  C.Formation of the Two Poles of the Earth.

  D.A New Approach to the Study or Geophysics.

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• 7The word “flip” (Line 6, Par

  A.2) most probably means “________”.A.decline

  B.intensify

  C.fluctuate

  D.reverse

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• 8What have the two French geophysicists discovered in their research、

  A.Some regularity in the changes of the earth’s magnetic field.

  B.Some causes of the fluctuation of the earth’s magnetic field.

  C.The origin of the earth’s magnetic fiel

  D.D.The frequency of polarity reversals.

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• 9The French geophysicists’ study is different from currently prevailing theories in ________.

  A.its identification of the origin of the earth’s magnetic field

  B.the way the earth’s magnetic intensity is measured

  C.its explanation of the shift in the earth’s polarity

  D.the way the earth’s fluctuation rhythm is defined

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• 10In Peter Oslo’s opinion the French experiment ________.

  A.is likely to direct further research in the inner physics of the earth

  B.has successfully solved the mystery of polarity reversals

  C.is certain to help predict external disasters

  D.has caused great confusion among the world’s geophysicists

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