____ most of the earth's surface is covered by water, fresh water is very rare and precious.

试卷相关题目

• 1Many people believe we will suffer from more environmental disasters _____we change the way we live.

  A.but

  B.although

  C.so

  D.unless

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• 2— So you have met Maria?— Yes, it was last week ______ we attended Jack's party.

  A.where

  B.that

  C.when

  D.why

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• 3— How long have you ______ this book?— _____ 1994.

  A.had; Since

  B.bought; Since

  C.borrow; In

  D.kept; In

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• 4My classmates asked me ______ possible to improve their English in half a year.

  A.that it would be

  B.whether it would be

  C.if that would be

  D.whether would it be

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• 5I think I was at school, _____ I was staying with a friend during the vacation when I heard the news.

  A.even so

  B.and then

  C.so that

  D.or else

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• 6The American Civil War lasted four years ________ the North won in the end.

  A.after

  B.before

  C.when

  D.then

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• 7_____ I prefer a color TV, I have to buy a black and white one this time.

  A.As

  B.Since

  C.Because

  D.Although

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• 8— 'How long do you suppose it is _______ he left for Japan?' — 'No more than half a month.' 

  A.when

  B.before

  C.after

  D.since

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• 9There is a widespread belief among the science world ____ we keep on _____  the earth as we are doing today, the existence of us humans on this planet will be out of the question in some years yet to come.

  A.if; polluting

  B.if; to pollute

  C.that if; to pollute

  D.that if; polluting

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• 10I'm sorry you've been waiting so long, but it'll still be some time ______ Brian gets back.

  A.before

  B.since

  C.till

  D.after

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