高考英语连词练习45

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• 21When astronauts return to the earth's atmosphere, helicopters fly to________they would land, ready to collect them.

  A.what

  B.where

  C.which

  D.that

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• 22   The UN has warned that,_____ natural systems like forests and wetlands disappear , mankind is losing the services they provide such as protection from extreme weather.

  A.while

  B.once

  C.when

  D.as

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• 23The newly built café, the walls of_______ are painted light green, is really a peaceful place for us, specially after hard work.

  A.that

  B.it

  C.what

  D.which

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• 24. ____ I am concerned, we should be brave and we will reach the top of the hill at last ____ we try our best to climb the hill.

  A.So long as; as long as

  B.As far as; as longer as

  C.So long as; as far as

  D.As far as; as long as

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• 25She is getting better by degrees, but it will be some time _____ she is completely well.

  A.that

  B.since

  C.when

  D.before

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• 2640. —Shall Tom go and play football? —Not ________ he has finished his homework.

  A.when

  B.if

  C.unless

  D.once

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• 27Your sister has grown up. She is no longer __________ she five years ago when I first saw her.

  A.what

  B.who

  C.whom

  D.which

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• 28She had hardly got back to the kitchen ________ the doorbell rang.

  A.when

  B.than

  C.as

  D.as soon as

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• 29It still puzzles today's scientists ______ some mammals produce their young ______ others lay eggs to produce their offspring( 后代)

  A.that; while

  B.why; while

  C.how; when

  D.what; as

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• 30The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.

  A.who

  B.when

  C.on which

  D.Which

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