The word “this” in Line 4 refers to ________.

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• 1What is most important to agriculture is ________.

  A.the amount of food it produces

  B.the per capital income of farmers

  C.its industrial performance

  D.the production of investment goods

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• 2This passage is most probably ________.

  A.a news item

  B.part of an introduction of a book

  C.part of a lecture

  D.an advertisement

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• 3The writer of this passage ________.

  A.gives an objective account of the mirrors

  B.seems to be much worried about the effect of the mirrors

  C.is in favour of the wide use of the mirrors

  D.suggests that artificial daylight is harmful to living being

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• 4The purpose for turning night into day is to ________.

  A.confuse animals and plants

  B.light up more cities

  C.save energy and deal with emergencies

  D.enable people to work longer hours

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• 5The reflected light should sweep slowly along the surface of the earth because the mirrors ________.

  A.would be operated by solar-powered engines

  B.would orbit thousands of miles high to catch the sun’s light

  C.could move around the earth at the same speed as the earth turns on its axis

  D.could be made to adjust their angles

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• 6The performance of farmers essentially determines ________.

  A.the size of the working population

  B.the organization of agriculture

  C.the market structure

  D.the general development of economy

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• 7This passage will most probably be followed by a discussion of ________.

  A.the structure of American farming population

  B.the market structure of American agriculture

  C.the various functions of American agriculture

  D.the organization of American agriculture

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• 8What is the main topic of this passage、

  A.The secret of Alamogordo.

  B.A new kind of war.

  C.The destructive force of the first atomic bomb.

  D.The selection of the test site for the first atomic bomb.

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• 9Which of the following is the main reason for choosing Alamogordo as the test site、

  A.It always had an enjoyable climate.

  B.It was connected to other cities by a railway.

  C.Its location would hide the secret well.

  D.It was situated in southwestern New Mexico.

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• 10When was the atomic bomb dropped on Hiroshima、

  A.As soon as the secret was revealed

  B.At dawn on July 16, 1945

  C.Immediately after the test

  D.Several weeks after the test

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