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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(為……殺菌) 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．
小題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

小題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

小題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.

小題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

小題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

小題1:D
小題2:A
小題3:B
小題4:A
小題5:C

試題分析：本文敘述了人們手上的細菌有好處，現在警察利用人們手上的細菌可以幫助破案，因為人的指紋有可能被破壞了，看不清了，但是人們接觸過的東西上面的細菌卻還有，并且人與人是不同的，所以可以根據這個來找到警察要找的罪犯。
小題1:細節理解題。根據according to a recent study, investigators could even use microbes to help break a criminal case.指紋來幫助破案，故選D。
小題2:細節理解題。根據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.故選A。
小題3:細節理解題。根據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.通過看鍵盤很容易的辨別誰用了這個電腦。故選B。
小題4:細節理解題。根據你的細菌能夠泄漏秘密，故選A。
小題5:主旨大意題。根據C
點評：細節理解題可以分為集中型細節理解題和分散型細節理解題。集中型：就文章的單個細節提問，答案在原文中出現的位置一般也位于單句話或幾句話中。因為具體細節不同，出題形式千變萬化，因題而異。分散型：題目涉及到文章某一段或幾段，甚至貫穿全文的各個位置，需要考生尋找文章中的多個細節。請注意，分散型細節理解題并不意味著題目的正確答案出現在文章的不同位置，正確答案往往也是關于文章的某一個句子或細節。

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A．women always speak more words than men

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A．paid attention to

B．related to

C．put pressure on

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A．test which part of the brain is key to language in rats and humans

B．prove the levels of Foxp2 protein in humans and rats are different

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D．discover the association between Foxp2protein and vocal communication

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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.
HOW TO USE THE MICROSCOPE:
1. Plug(接通電源) 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(微調)the focus.
8. Without changing the focus knobs, switch to the HIGH POWER objective lens. Once you have switched to HIGH POWER, use only the fine focus knob to make the image sharper.
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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.

小題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.

小題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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