3.Look closely at your hands.Are they clean?It doesn't matter how many times you wash your hands,tiny microbes(微生物)still stay on them.But don't worry.Most microbes don't harm you.
Now scientists say the microbes on our hands could be used in a surprising way:fighting crime.According to a recent study,microbes as well as fingerprints(指紋)could be used to identify the criminal.
Everyone has his own set of microbes on the hands.That is to say,if you and your best friend were able to see and compare all the microbes on your hands,your hands probably would look different.Some microbes only show up on your hands while others live only on your friend's hands.
When you work on a computer,you leave the microbes from your hands on the keyboard.The scientists can easily tell the owner of the keyboard by looking at the microbes on it.Even if you don't leave your fingerprints behind,your microbes may give you away.
Noah Fierer,a scientist says,"You can only clean a fingerprint,but you can't sterilize(使無菌)a surface just by wiping(擦)it off."He says that scientists have a lot more work to do before the microbe is used as a useful tool.
31.According to the passage,Acould be used to identify the criminal.
A.fingerprints and microbes on people's hands
B.fingerprints
C.scientists'hands
D.microbes
32.Paragraph 3tells us thatD.
A.our hands look similar
B.the microbes will make the keyboard dirty
C.we should compare our hands often
D.we have our own sets of microbes
33.When you work on a computer,the microbesB.
A.just stay on your hands
B.a(chǎn)lso stay on the keyboard
C.will do harm to you
D.will disappear
34.From Noah Fierer we know thatC.
A.fingerprints are no longer useful in fighting crime
B.microbes can be found on everyone's hands
C.unlike microbes,fingerprints can be cleaned if people wipe them
D.the microbe is used as a useful tool
35.What's the best title of the passage?C
A.Microbes May Tell Who You Are
B.Scientists Say Everyone Has Microbes
C.Noah Fierer Does Research Into Microbes
D.Fingerprints Help Catch Criminals.