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

试卷相关题目

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

  A.surround

  B.is surrounded

  C.surrounding

  D.surrounded

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• 2Between 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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• 3The 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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• 4______ 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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• 5_______ his arms over his head, Lincoln declared he was the “big buck of the lick.”

  A.Wave

  B.Waving

  C.Waved

  D.Been waved

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• 6For 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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• 7The 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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• 8There 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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• 9_______ 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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• 10An air ship _______ by energy from the sun has been suggested.

  A.powering

  B.to power

  C.is powered

  D.powered

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