It can be good for health when one takes a walk every 2 or 3 days for at least______．

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• 1The first study on 41 elderly people found______．

  A.the less-fit participants did arrow tasks faster

  B.the fitter participants did arrow tasks faster

  C.the less-fit participants gave more accurate answers

  D.the fitter participants gave more accurate answers

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• 2After taking exercise for a few weeks，the mice were found to have_____．

  A.higher blood pressure

  B.faster heartbeat

  C.more blood flow to the brain

  D.better appearance

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• 3Walking regularly helps elderly people_______．

  A.lose weight

  B.become happier

  C.concentrate better

  D.look younger

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• 4A major earthquake striking San Francisco someday is inevitable．

  A.Right

  B.Wrong

  C.Not mentioned

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• 5Scientist will be able to predict the exact time of an earthquake soon．

  A.Right

  B.Wrong

  C.Not mentioned

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• 6It is suggested in the last paragraph that people should______．

  A.run around once a week

  B.not read and walk at the same time

  C.go for a walk every day

  D.not hurt their friends while exercising

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• 7What is meant by"death chemical"mentioned in paragraph 3、

  A.A chemical that contains poison．

  B.A chemical that causes death．

  C.A chemical that announces death．

  D.A chemical that prevents death．

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• 8Which of the following statements is NOT true of ants、

  A.Ants know very soon that another ant is dead．

  B.When an ant is dead，others move its body out of the nest．

  C.If an ant is unconscious，it is moved out of the nest．

  D.Living ants have the"I'm dead"chemical on their bodies．

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• 9According to Choe's hypothesis，___________.

  A.an ant still smells like a living when it dies

  B.the"I am dead"chemical leaves the ant's body when it dies

  C.the"I am not dead yet"chemical is left when an ant dies

  D.the"I am not dead yet"chemical leaves the ant's body when it dies

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• 10According to paragraph 7，what is the result of the test on Choe's hyothesis、

  A.It shows that his hypothesis is wrong．

  B.It proves that his hypothesis is convincing．

  C.It suggests that his hypothesis needs revising．

  D.Not enough evidence has been found to support his hypothesis．

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