I have kept that portrait ________ I can see it every day, as it always reminds me of my university days in London.

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• 1I’m not sure whether I can gain any profit from the investment, so I can’t make a(n) ________ promise to help you.

  A.exact

  B.defined

  C.definite

  D.sure

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• 2The ability to store knowledge makes computers different form every other machine ________ invented.

  A.ever

  B.thus

  C.yet

  D.as

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• 3A love marriage, however, does not necessarily ________ much sharing of interests and responsibilities.

  A.take over

  B.result in

  C.hold on

  D.keep to

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• 4I felt somewhat disappointed and was about to leave, ________ something occurred which attracted my attention.

  A.unless

  B.until

  C.when

  D.while

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• 5Jean doesn’t want to work right away because she thinks that if she ________ a job she probably wouldn’t be able to see her friends very often.

  A.has to get

  B.were to get

  C.had got

  D.could have got

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• 6The sports meet, originally due to be held last Friday, was finally ________ because of the bad weather.

  A.set off

  B.broken off

  C.worn off

  D.called off

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• 7According to the first paragraph, the atmosphere is essential to man in that ________.

  A.it protects him against the harmful rays from space

  B.it provides sufficient light for plant growth

  C.it supplies the heat necessary for human survival

  D.it screens off the falling meteors

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• 8We know from the passage that ________.

  A.exposure to even tiny amounts of radiation is fatal

  B.the effect of exposure to radiation is slow in coming

  C.radiation is avoidable in space exploration

  D.astronauts in spacesuits needn’t worry about radiation damage

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• 9The harm radiation has done to the Apollo crew members ________.

  A.is insignificant

  B.seems overestimated

  C.is enormous

  D.remains unknown

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• 10It can be inferred from the passage that ________.

  A.the Apollo mission was very successful

  B.protection from space radiation is no easy job

  C.astronauts will have deformed children or grandchildren

  D.radiation is not a threat to well-protected space explorers

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