Look closely at your hands. Are they clean? It doesn't matter how many times you wash your hands, tiny microbes still stay on them. But don't worry. Most microbes don't harm you.Now scientists say the 题目和参考答案——青夏教育精英家教网——

题目内容

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 survey microbes as well as fingerprints(指纹) could be used to indentify 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 (使无菌) 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.
【小题1】According to the passage,_______ could be used to identify the criminal.

A．fingerprints	B．scientists' hands
C．microbes	D．fingerprints and microbes on people's hands

【小题2】Paragraph 3 tells us that________.

A．our hands look similar	B．the microbes will make the keyboard dirty.
C．we should compare hands often	D．we have our own sets of microbes.

【小题3】When you work on computer, the microbes________.

A．just stay on our hands	B．also stay on the keyboard
C．will do harm to you	D．will disappear

【小题4】From Noah Fierer we know that________.

A．fingerprints are no longer useful in fighting crime

B．microbes can be found on everyone's hands.

C．unlike microbe fingerprints can be cleaned if people wipe them

D．the microbe is used as a useful tool

【小题5】What’s the best title of the passage?

A．Microbes May Tell Who You Are	B．Scientists Say Everyone Has Microbes
C．Noah Fiercer Does Research Into Microbes	D．Fingerprints Help Catch Criminals

【小题1】D
【小题1】D
【小题1】B
【小题1】C
【小题1】C

解析

练习册系列答案

随堂小考系列答案

成才之路高中新课程学习指导系列答案

同步轻松练习系列答案

课课通课程标准思维方法与能力训练系列答案

钟书金牌教材金练系列答案

名牌学校分层课课练系列答案

培优夺冠王系列答案

百分百夺冠卷系列答案

期末夺冠百分百金牌卷系列答案

同步单元测试AB卷系列答案

相关题目

用词的正确形式填空

Do you see that? Look ________ (close), you can see a small bag.

用词的正确形式填空．

Look ________ (close) and describe what you see.

选词填空

If you look ________ (close; closely) at the twins, you will find the differences between them.

用所给词的适当形式完成下列短文
Christmas was coming. A lot of 1 were going to town. They hoped to 2 some vegetables, fruit and meat in the market. And then they were going to buy some 3 for their families. A bus came. They tried to 4 . Robert, a strong young man, rushed in first. He occupied(占)two 5 :　one for his girl friend Mable and the other for himself.
　　The bus started. Robert had a look 6 the bus. He saw a lot of people 7 there. There were some old men among them. He hurried to 8 his eyes. Mable found it and thought he felt 9 and asked, “What's wrong with you, dear?”“ 10 ,”answered the kind-hearted (好心肠) young man. “I can't bear (忍心) to see the poor old men!”

C．farmers　　

C．borrow　　

C．newspapers　　

A．get on　　

C．boxes　　

A．standing　

B．sitting　　

C．lying　　

B．look over　

C．happy　　

B．Anything　

Home Alone
It was Sunday afternoon. My brother and I were alone at home. My parents went for a party and asked me to look after my brother. I was doing my homework while my younger brother was watching TV. Suddenly the doorbell rang. Ding-Dong! My brother thought that it was our parents, so he opened the      1  quickly.
A tall man wearing a black raincoat stood outside. He said that he came to sell books and asked politely     2  our parents were at home.
Without thinking, my brother said, "No." Then the man asked if we would like to 3 some story books. I refused him. When I wanted to close the door, he suddenly pushed the door very      4   and came into our house. He took out a     5    and ordered me to tie up my brother's hands with a rope. I tied up his hands in a special way so my brother could untie
     6    easily. The man then tied my hands up and locked     7    of us in the kitchen. Soon, he went upstairs to     8  money. I taught my brother to untie the rope on his    9 .He then untied me. I rushed to the telephone to call the police,     10     the line was dead. The doors were all locked from the outside. It was lucky that the man      11   to lock the kitchen window. We got out of the house through the kitchen window and went to the   12 pay phone to call the police.
Soon   13 came to our house and the man was caught. By that time, my parents had come home. We told them the whole story. My parents were   14 that we were not hurt. They told me that I should stop my brother from   15 the door to strangers. I learnt a lesson on safety.
(    ) 1. A. window         B. door         C. book        D. fridge
(    ) 2. A. if               B. why         C. when        D. how
(    ) 3. A. lend         B. borrow      C. sell            D. buy
(    ) 4. A. politely           B. slowly      C. hard        D. quietly
(    ) 5. A. book             B. knife       C. gift        D. pen
(    ) 6. A. himself      B. myself          C. herself         D. themselves
(    ) 7. A. none          B. neither         C. both        D. all
(    ) 8. A. look at            B. look after C. look like       D. look for
(    ) 9. A. feet              B. hands       C. neck        D. legs
(    ) 10. A. and         B. so             C. or          D. but
(    ) 11. A. wanted          B. remembered   C. forgot          D. tried
(    ) 12. A. farthest        B. nearest         C. largest         D. smallest
(    ) 13. A. my friends        B. the police       C. the neighbors    D. my parents
(    ) 14. A. glad            B. angry       C. sad         D. sorry
(    ) 15. A. cleaning        B. closing     C. locking         D. opening