By immersing ore particles in water, ____________.

试卷相关题目

• 1In 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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• 2It 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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• 3The 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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• 4According 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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• 5According to the announcement which of the following is true of special summer hours for the library、

  A.It has them only on the weekends.

  B.It has them both weekdays and weekends.

  C.It has no special summer hours.

  D.The information is not availabl

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• 6We understand from the passage that the United States ____________.

  A.is rich in low-grade aluminum-beating ores

  B.is short of aluminum-making techniques

  C.has to import ninety percent of its annual need of aluminum

  D.has to produce fifty percent of the world's supply to meet its annual aluminum demand

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• 7What kind of person needs this service、

  A.A doctor.

  B.A policeman.

  C.The sick.

  D.A student.

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• 8How 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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• 9If 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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• 10When 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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