because

　　.

　　A. it’s easy to get a cold when taking a bath

　　B. the showerhead carries many bacteria causing illness

　　C. we don’t get cleaned while showering

　　D. we don’t get a weak immune system 57. According to the passage, which of the following is TRUE?

　　A. Hot water could kill most of bacteria in showerheads.

　　B. Of 45 showerheads surveyed in nine cities, 30 carried large amounts of Mycobacterium.

　　C. Changing showerheads is the only way to avoid microorganisms.

　　D. Shower water contains much less bacteria after being left to run for 30 seconds.

　　58. We can learn from the third paragraph that

　　.

　　A. having a shower in the morning is more dangerous than at other time

　　B. the bacteria always threat people’s health

　　C. there is no reason to fear microorganisms for people with strong immune system

　　D. it is better to do some exercise in the morning than have a shower

　　59. The underlined word “pose” in the third paragraph probably means “______”． A. cause     

　　B. avoid       

　　C. describe 

　　D. promise

　　60. What contributes to fresh air in US subways?

　　A. The train’s movement.         

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