However, Pace had good news too. He has also been testing the air in US subways. Apart from iron particles (微粒),which are ground off the track by the wheels of trains, subway air is fresh. The reason is that a train’s movement pumps fresh outdoor air into the tunnels.
Pace explained that he wanted to understand the natural microbial environments of public places. This kind of knowledge might help discover the microbes to be used in a bioterrorist (生物恐怖分子) attack.
5.From the finding of Norman R. Pace, after taking a shower, we might cough or feel tired because________.
A.its easy to get a cold when taking a bath
B.the showerhead carries many bacteria causing illness
C.we dont get cleaned while showering
D.we dont get a weak immune system
6.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.
7.We can learn from the third paragraph that________.
A.having a shower in the morning is more dangerous than at other time
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