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

试卷相关题目

• 1They forced ____ little children to work all day for so little money____ everyone couldn't bear that.

  A.so; as

  B.so; that

  C.such; as

  D.such; that

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• 2_______ you work hard, you won't solve this problem.

  A.Even

  B.As

  C.Unless

  D.Since

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• 3___ you understand this rule, you will have no further difficulty.

  A.Once

  B.At once

  C.Only

  D.Only then

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• 4It is so difficult a question_______ none of the kids could work it out.

  A.as

  B.that

  C.which

  D.X

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• 5I'm sorry, _________ I won't be able to come tonight.

  A.for

  B.and

  C.but

  D.then

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• 6The doctors have done ______ they could ______the child.

  A.whatever; to save

  B.everything ; save

  C.all what; to save

  D.all which; save

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