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

试卷相关题目

• 1With 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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• 2Which 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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• 3Identical 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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• 4From 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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• 5Scientists expect that the atomic clocks will be_______.

  A.more durable

  B.indestructible

  C.more precise

  D.absolutely accurate

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• 6According 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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• 7In 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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