Scientists expect that the atomic clocks will be_______.

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• 1From 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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• 2We 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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• 3Nuclear energy is a special sort of_____

  A.uranium

  B.chemical energy

  C.radiant energy

  D.electricity generated in atomic plants

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• 4In a toaster, _______ energy becomes heather gy.

  A.electrical

  B.mechanical

  C.heat

  D.radiant

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• 5At he beginning of the Games in the host country _______

  A.a torch is ignited at sunrise

  B.a lighted torch is brought into the stadium

  C.relays of runners light their torches in the stadium

  D.a torch is ignited by the Greek ambassador

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• 6From 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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• 7Identical 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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• 8Which is implied but not stated、

  A.Precise timekeeping is essential in science.

  B.Scientists expect to disprove Einstein's relativity theories.

  C.Atomic clocks will be important in space flight.

  D.The rate of vibration of an atom never varies.

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• 9With 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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• 10It can be inferred from the passage that insects do not have _______.

  A.nerve cells

  B.reflexes

  C.brains

  D.Backbones

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