It is true that there are still abundant reserves of metals which have not yet been _____ ，but it is necessary to take steps to ensure that alternative materiasls are substituted whenever possible.

试卷相关题目

• 1The body apparently resents being dosed with unusual amounts of a vitamin or mineral and its first _____ is to excrete them.

  A.reaction

  B.impulse

  C.response

  D.instinct

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• 2That summer I drove west with a friend，and we _____ a little money doing odd jobs and as much as possible visited his relatives.

  A.picked up

  B.stepped up

  C.put aside

  D.set aside

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• 3No longer are contributions to computer technology confined to any one country. _____ is this more true than in Europe.

  A.Hardly

  B.Little

  C.Seldom

  D.Nowhere

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• 4The bond of true affection had pulled us six very different men from six very different countries across Antarctica；we proved in the end that we weren't very different _____ .

  A.for all

  B.as usual

  C.after all

  D.in particular

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• 5If English is not our first language you can often be puzzled by ways of expression that the native speakers of English does not even have to _____ .

  A.think out

  B.think about

  C.think over

  D.think for

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• 6Researchers _____ that genes may determine the strength of the immune system，which could help explain how an infectious disease could have a hereditary link.

  A.speculate

  B.estimate

  C.evaluate

  D.anticipate

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• 7She had on the dress that I used to admire more than anything else in her possession a light blue one _____ prettily with lace.

  A.ornamented

  B.trimmed

  C.furnished

  D.decorated

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• 8In a sense，tennis and Taijiquan are similar in that they both require your full attention，and if done _____ ，take your mind off daily problems and preoccupations.

  A.successfully

  B.consecutively

  C.conscientiously

  D.compulsorily

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• 9Such apartments as she saw were either disgustingly dirty or _____ dear,or both.

  A.exceedingly

  B.substantially

  C.unaccountably

  D.excessively

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• 10Deprived of the financial means to remain independent，Thomas Edison was compelled to _____ employment as a night telephone operator.

  A.obtain

  B.chase

  C.explore

  D.seek

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