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

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• 1It 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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• 2It can be good for health when one takes a walk every 2 or 3 days for at least______．

  A.3 minutes

  B.45 minutes

  C.30 minutes

  D.10 minutes

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• 3The 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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• 4After 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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• 5Walking regularly helps elderly people_______．

  A.lose weight

  B.become happier

  C.concentrate better

  D.look younger

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• 6Which 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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• 7According 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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• 8According 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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• 9The passage"Night of the Living Ants"tells us about________.

  A.how an ant is moved out of the nest at nigh

  B.what an ant does at night

  C.how an ant finds its way in darkness

  D.what happens when an ant dies

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• 10The body of the iceman was found in the mountains mainly because__________．

  A.two Germans were climbing mountains

  B.he was just on a mountain pass

  C.the melted ice made him visible

  D.he was lying on the ice

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