If all the continents and mountains were bulldozed flat, the earth __ covered bywater.

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• 1Ecology, __ the relationships between organisms and their environments, is alsoimportant in petroleum geology.

  A.the study of

  B.it study

  C.that study

  D.studying

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• 2"Has he come back、 .... Yes, he __ back for three days.

  A.has come

  B.had come

  C.is

  D.has been

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• 3A biologist does not merely describe organisms, but tries to learn __ act as theydo.

  A.what to cause them

  B.what cause to them

  C.what causes them to

  D.causes them to what

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• 4Please have your doctor __ that prescription.

  A.signed

  B.to sign

  C.signing

  D.sign

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• 5We've bought a new house. We'll move in soon and we need to buy __ furniture.

  A.some other

  B.another

  C.other

  D.others

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• 6Those __ have six or more close friends are likely to describe themselves as"very happy".

  A.who

  B.whose

  C.which

  D.they

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• 7Some habits of__ are incompatible with good health.

  A.my husband

  B.my husbands'

  C.my husband's

  D.my husbands

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• 8Unlike the North Pole, the South Pole is

  A.not fixed in one position

  B.the same as the South Magnetic Pole

  C.on land covered with ice

  D.on water

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• 9The large area in the southern hemisphere is taken up by

  A.the major part of South America

  B.oceans

  C.Australia

  D.Africa

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• 10The makers of the Antarctic Treaty clearly wanted to

  A.prevent the Russians from settling in Antarctica

  B.prevent possession or control by any nation

  C.conserve its natural resources

  D.insure the safety of the natives of Antarctica

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