There is also an interest in sea horse, puffers and other salty types with shapes ____ and colors ____ than even the showiest of fresh-water fish.

试卷相关题目

• 1The gas-oil contact or gas-water contact_____ the lower limit of producible gas.

  A.is

  B.are

  C.were

  D.has been

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• 2For the creatures to become oil, it was necessary that they ______ between layers of rock for an enormous length of time.

  A.been imprisoned

  B.shall be imprison

  C.should be imprison

  D.will be imprisoned

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• 3The assumption _____ human cloning rests is that all genetic cells contain exact copies of the original set o9f genetic instructions.

  A.on which

  B.on that

  C.at which

  D.which

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• 4The water ________ Manhattan has been very important to New York.

  A.surround

  B.is surrounded

  C.surrounding

  D.surrounded

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• 5Between 1890 and 1970 the monetary costs of supplying energy _____ more or less constant or declined.

  A.to stay

  B.was stayed

  C.stayed

  D.has stayed

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• 6_______ was a planted sapling of the American redwood tree.

  A.There is one of the gifts

  B.One of the gifts that

  C.That one of the gifts

  D.One of the gifts

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• 7An air ship _______ by energy from the sun has been suggested.

  A.powering

  B.to power

  C.is powered

  D.powered

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• 8Most scientists agree _______ was hot for at least a time.

  A.some of the moon that

  B.some of the moon it

  C.that some of the moon

  D.while some of the moon

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• 9A group of scientists demanded that the federal government ____ all the studies it has founded on cloning.

  A.reveal

  B.revealed

  C.is revealing

  D.must reveal

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• 10_______ hearing is really produced in all animals by the effect of pressure is not definitely known by scientists.

  A.If or not

  B.Whether or not

  C.have never heard of

  D.had never heard of

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