We understand from the passage that the United States ____________.

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• 1By immersing ore particles in water, ____________.

  A.we can get ore particles of equal size

  B.we can purify aluminum particles

  C.we can filter out aluminum

  D.we can improve the working conditions around

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• 2In the second paragraph the word "paramagnetic" means ___________.

  A.slightly magnetic

  B.a weak magnetic field

  C.a strong magnetic substance

  D.the under-water magnetic power

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• 3It is believed that a new technique to _________ will probably be found.

  A.recycle old aluminum products

  B.discover more bauxite ores

  C.make aluminum by putting ore particles under water

  D.take out aluminum magnetically from poorer ores

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• 4The passage focuses on _____________.

  A.construction and manufacturing industry in the United States

  B.new technique of obtaining aluminum from poor ores

  C.consumption and production of aluminum in the United States

  D.the annual import of high-grade aluminum into the United States

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• 5According to the announcement, a validated identification card is required to __________.

  A.ride on intercampus buses

  B.read announcements in the cafeteria

  C.make use of the infirmary

  D.check books out of' the library

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• 6What kind of person needs this service、

  A.A doctor.

  B.A policeman.

  C.The sick.

  D.A student.

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• 7How much will it cost you if you want five regular papers and two graphs to be typed、

  A.$5

  B.$1

  C.$5.5

  D.$6

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• 8If you have 20 pages to be typed, how long does it take to get them finished、

  A.More than 48 hours

  B.More than 24 hours.

  C.Within 24 hours.

  D.In 24 minutes.

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• 9When does the typing service close on Wednesday、

  A.10:00 p.m.

  B.8:00 p.m.

  C.4:00 p.m.

  D.It's closed all day.

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• 10The main purpose of this passage is __________.

  A.to criticize

  B.to describe

  C.to advertise

  D.to celebrate

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