Look closely at ,your hands-are they clean? It doesn't matter how many times you was your hands. They're still crowded with microbes, which are also called germs or bacteria . Microbes are everywhere. 题目和参考答案——青夏教育精英家教网—

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Look closely at ,your hands-are they clean? It doesn't matter how many times you was your hands. They're still crowded with microbes, which are also called "germs" or "bacteria". Microbes are everywhere. But don't worry-most microbes don't harm you. and many actually help you stay alive.
Now, scientists say the microbes that live on our hands could be used in a surprising way: fighting crime.
When police visit the scene of a crime, they often look for fingerprints to try to identifythe criminal. But according to a recent study, investigators could even use microbes to help break a criminal case.
Every person has his or her own set of microbes that live on their hands, according to scientists at,the University of:Colorado. That means the mix of different kinds of microbes on everybody's hand is unique-much like one's fingerprint.
The scientists wanted to know whether this microbe mix could be used as a new kind of fingerprint-especially in a crime scene where fingerprints might be hard to find. And policemen use forensics such as studying fingerprints to identify the criminal.
"Microbe fingerprints are harder to hide," said Noah Fierer, one of the scientists.
"You can't sterilize(为……杀菌) a surface just by wiping it off. "
His team compared the bacteria on the hands of 273 people with the bacteria found on each person's computer keyboard. For the study, the keyboards had been used only by the people who were being tested. The study showed that the mix of microbes from each per- son's hands matched the mix of microbes on that person's keyboard. The scientists were easily able to tell the 273 people apart-just by looking at their keyboards.
But there are a lot more than 273 criminals. Other scientists wonder whetherthe microbe fingerprint can really be that useful.
Fierer agrees that scientists have a lot more work to do before the microbe fingerprint will be a useful tool．
小题1:According to the passage, microbes on people's hands_____

A．do more harm than good	B．are easy to get rid of
C．are almost the same	D．might help find crimes

小题2:The underlined word "forensics" in Paragraph 5 probably refers to________.

A．the scientific test used by police

B．a new kind of fingerprint

C．a kind of bacteria'in people's hands

D．a kind of newly invented keyboard

小题3:What did Fierer's team find through the study?

A．They found the criminal among the 237 people.

B．They could tell who had used which computer.

C．Computer keyboards couldn't keep people's microbe fingerprints.

D．People's characters could be identified by the keyboards they used.

小题4:We can learn from the passage that ______.

A．your microbes may give you away

B．scientists will come to a clear conclusion soon

C．many scientists think microbe fingerprints useless

D．the microbe fingerprint has been used in many cases

小题5:The main idea of the passage is about_____.

A．the importance of fingerprints	B．how to clean our hands
C．the usefulness of microbes	D．different germs on our hands

小题1:D
小题2:A
小题3:B
小题4:A
小题5:C

试题分析：本文叙述了人们手上的细菌有好处，现在警察利用人们手上的细菌可以帮助破案，因为人的指纹有可能被破坏了，看不清了，但是人们接触过的东西上面的细菌却还有，并且人与人是不同的，所以可以根据这个来找到警察要找的罪犯。
小题1:细节理解题。根据according to a recent study, investigators could even use microbes to help break a criminal case.指纹来帮助破案，故选D。
小题2:细节理解题。根据The scientists wanted to know whether this microbe mix could be used as a new kind of fingerprint-especially in a crime scene where fingerprints might be hard to find. And policemen use forensics such as studying fingerprints to identify the criminal.故选A。
小题3:细节理解题。根据For the study, the keyboards had been used only by the people who were being tested. The study showed that the mix of microbes from each per- son's hands matched the mix of microbes on that person's keyboard. The scientists were easily able to tell the 273 people apart-just by looking at their keyboards.通过看键盘很容易的辨别谁用了这个电脑。故选B。
小题4:细节理解题。根据你的细菌能够泄漏秘密，故选A。
小题5:主旨大意题。根据C
点评：细节理解题可以分为集中型细节理解题和分散型细节理解题。集中型：就文章的单个细节提问，答案在原文中出现的位置一般也位于单句话或几句话中。因为具体细节不同，出题形式千变万化，因题而异。分散型：题目涉及到文章某一段或几段，甚至贯穿全文的各个位置，需要考生寻找文章中的多个细节。请注意，分散型细节理解题并不意味着题目的正确答案出现在文章的不同位置，正确答案往往也是关于文章的某一个句子或细节。

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A microscope is a useful instrument for observing small objects. By producing a bigger image, the microscope reveals details that are undetectable to the naked eye(裸眼).
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CAUTION: Microscopes are both delicate and expensive and must be handled with care.
1. Always carry the microscope with two hands — one supporting the base and the other on the arm.
2. Avoid stretching the wire of the lamp across a walkway.
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4. To avoid crushing the glass slide when focusing, begin with the lens close to the specimen and gradually back off to focus.
5. Keep the microscope covered to prevent the dust while it is being stored.
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1. Plug(接通电源) in the lamp.
2. Place a sample of what you wish to observe on a slide.
3. Adjust the mirror so it reflects light from the room up into the objective lens. When the mirror is correctly adjusted, a complete circle of light iwll appear when you look through the eyepiece.
4. Place your slide with the specimen directly over the center of the glass circle on teh stage. If it is a wet slide, be sure the bottom of the slide is dry.
5. With the LOW POWER objective leans placed over the slide, use the coarse focus knob to lower the lens to the lowest point.
6. Look through the eyepiece with one eye while closing the other eye. Slowly raise the lens until teh focus is relatively clear.
7. Use the fine focus knob to fine -tune(微调)the focus.
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A．Use one hand to carry the microscope

B．Place a sample directly on the clean stage

C．When stored, the microscope should be adjusted.

D．Look through the eyepiece with one eye.

小题2:If you want to observe a thin piece of hair, which of the following should you do first.?

A．Switch to objective lens.	B．Adjust the mirror.
C．Look through the eyepiece.	D．Place the hair on a glass slide.

小题3:According to the text, you could see a complete circle of light _____.

A．after correctly adjusting the mirror

B．while looking at the specimen on a glass slide

C．after slowly raising the objective lens

D．before positioning the mirror correctly

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