Which of the following can tell the main idea of the passage、

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• 1According to Paragraph 2, which of the following does not describe the characteristics of a microwave heater、

  A.It directly heats people in a room.

  B.It heats walls and furniture in a room.

  C.It is safe.

  D.It saves energy．

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• 2The test conducted by Buffler shows that when a person feels comfortable warmth, he receives about ________________.

  A.20 mw. / sq. cm.

  B.40 mw. / sq. cm.

  C.60 mw. / sq. cm.

  D.85 mw. / sq. cm.

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• 3According to Paragraph 4, which of the following fills the room with low-power microwaves、

  A.The magnetron.

  B.The motion detector.

  C.The microwave oven.

  D.The radiation-absorbing chemical.

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• 4Which of the following statements about microwave heaters would Buffler most probably agree with、

  A.Microwave heaters will soon be widely used by homeowners.

  B.Microwave heaters sometimes make people feel uncomfortable.

  C.Perhaps microwave heaters will be first used by livestock farmers, who wish to protect their lambs in winter.

  D.Microwave heaters cannot be accepted by the public because they are somewhat unsaf

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• 5The following examples except _______________ reflect man altering the balance of nature．

  A.man is covering huge areas with new kinds of plants

  B.man is facilitating the spread of animals into new regions．

  C.man is killing some species on a large scale

  D.man is getting to know the importance of keeping the balance of nature．

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