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

试卷相关题目

• 1It can be inferred from the passage that insects do not have _______.

  A.nerve cells

  B.reflexes

  C.brains

  D.Backbones

  开始考试点击查看答案
• 2With 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

  开始考试点击查看答案
• 3Which 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.

  开始考试点击查看答案
• 4Identical 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

  开始考试点击查看答案
• 5From 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

  开始考试点击查看答案
• 6In 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

  开始考试点击查看答案