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

试卷相关题目

• 1The 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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• 2The water ________ Manhattan has been very important to New York.

  A.surround

  B.is surrounded

  C.surrounding

  D.surrounded

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• 3Between 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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• 4The reward was not always given to everyone, nor _____ to those who deserved it most.

  A.it was not given

  B.was given

  C.it was not given nor

  D.was not it given

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• 5______ retire are still able to receive pension that they have paid into the social security system during their working days.

  A.Most people

  B.since most people

  C.Most people are

  D.Most people who

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• 6The 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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• 7There is also an interest in sea horse, puffers and other salty types with shapes ____ and colors ____ than even the showiest of fresh-water fish.

  A.more strange…more bright

  B.stranger…. brighter

  C.stranger… more brighter

  D.more strange…brighter

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• 8_______ 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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• 9An air ship _______ by energy from the sun has been suggested.

  A.powering

  B.to power

  C.is powered

  D.powered

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• 10Most 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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