Which is implied but not stated、

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• 1Identical atomic clocks may be used to check_____

  A.the accuracy of predictions based on theories of relativity

  B.all of Einstein's theories

  C.the effect of outer space on an atomic clock

  D.the actual speed of an orbiting satellite

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• 2From the selection, we may assume that temperature changes _______

  A.affect only ammonia molecules

  B.may affect the vibration rate of atoms

  C.affect the speed at which atoms travel

  D.do not affect atoms in any way

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• 3Scientists expect that the atomic clocks will be_______.

  A.more durable

  B.indestructible

  C.more precise

  D.absolutely accurate

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• 4From the facts given in this article we can tell that _______

  A.often a form of energy is useless to us until it becomes another form

  B.steam power is cheaper and better than electrical power

  C.in the near future, there will be enough nuclear power to supply all our energy needs

  D.energy can change to another form, but the new form cannot change hack into the old form

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• 5We use the terms combustion and oxidation when we talk about _______.

  A.the energy of a moving object

  B.connecting a generator to a steam turbine

  C.nuclear fission

  D.fuels which give off heat when they burn

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• 6With what topic is the passage mainly concerned、

  A.The anatomy of tiny organisms

  B.The sensory organs of invertebrates

  C.The importance of vision of fish and advanced mammals

  D.The origin of the brain and the central nervous system

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• 7It can be inferred from the passage that insects do not have _______.

  A.nerve cells

  B.reflexes

  C.brains

  D.Backbones

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• 8According to the passage, what helps to coordinate the complex physical activity of a mammal、

  A.The cerebrum

  B.The midbrain

  C.The cerebrum

  D.The forebrain

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• 9In the last paragraph, the phrase "took to" could best be replaced by which of the following、

  A.began

  B.fled to

  C.carried to

  D.became friendly toward

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