Why is it difficult to predict the possible effects of electromagnetic fields on an airplane’s computers、

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• 1Few airlines want to impose a total ban on their passengers using electronic devices because ________.

  A.they don’t believe there is such a danger as radio interference

  B.the harmful effect of electromagnetic interference is yet to be proved

  C.most passengers refuse to take a plane which bans the use of radio and cassette players

  D.they have other effective safety measures to fall back on

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• 2What is said about the over 100 aircraft incidents in the past 15 years、

  A.They may have been caused by the damage to the radio systems.

  B.They may have taken place during take-off and landing.

  C.They were proved to have been caused by the passengers’ portable computers.

  D.They were suspected to have resulted from electromagnetic interferenc

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• 3The passage is mainly about ________.

  A.a new regulation for al airlines

  B.the defects of electronic devices

  C.a possible cause of aircraft crashes

  D.effective safety measures for air flight

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• 4                                         Passage ThreeQuestions 18 to 20 are based on the passage you have just heard.

  A.It can be cooked in many ways.

  B.It is delicious but inexpensive.

  C.It gives higher yields than other grain crops.

  D.It grows easily in various conditions.

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• 5                                       Passage TwoQuestions 14 to 17 are based on the passage you have just heard.

  A.He didn’t like physics any more.

  B.His eyesight was too poor.

  C.Physics was too hard for him.

  D.He had to work to support himself.

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• 6It can be inferred from the passage that the author ________.

  A.is in favor of prohibiting passengers’ use of electronic devices completely

  B.has overestimated the danger of electromagnetic interference

  C.hasn’t formed his own opinion on this problem

  D.regards it as unreasonable to exercise a total ban during flight

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• 7According to the passage, U.S. leadership in public relations is being threatened because of ________.

  A.an unparalleled increase in the number of public relations companies

  B.shrinking cultural differences and new communications technologies

  C.the decreasing number of multinational corporations in the U.S.

  D.increased efforts of other countries in public relations

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• 8London could soon replace New York as the center of PR because ________.

  A.British companies are more ambitious than U.S. companies

  B.British companies place more importance on PR than U.S. companies

  C.British companies are heavily involved in planning activities

  D.four of the world’s top public relations agencies are British-owned

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• 9The word “provincial” (Line 2, Par

  A.3) most probably means “________”.A.limited in outlook

  B.like people from the provinces

  C.rigid in thinking

  D.interested in world financial affairs

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• 10We learn from the third paragraph that employees in the American PR industry ________.

  A.speak at least one foreign language fluently

  B.are ignorant about world geography

  C.are not as sophisticated as their European counterparts

  D.enjoy reading a great variety of English business publications

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