Your cellphone holds secrets about you. Besides the names and numbers that you’ve programmed into it, traces of your DNA remain on it, according to a new study. DNA is genetic material that appears i 题目和参考答案——青夏教育精英家教网—

题目内容

Your cellphone holds secrets about you. Besides the names and numbers that you’ve programmed into it, traces of your DNA remain on it, according to a new study.

DNA is genetic material that appears in every cell. Like your fingerprint, your DNA is unique to you - unless you have an identical twin. Scientists today usually analyze DNA in blood, saliva （唾液）or hair left behind at the scene of a crime. The results often help detectives identify criminals and victims.

Meghan J. McFadden, a biologist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cellphone and later dropped it. This made her wonder whether traces of DNA remained on cellphones - even when no blood was involved. To find out, she and a colleague collected flip-style （翻盖式）phones from 10 volunteers. They collected invisible traces of the users from two parts of the phone: the outside, where the user holds it, and the speaker, which is placed at the user’s ear.

The scientists cleaned the phones using a liquid mixture made mostly of alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones back for another week. Then they returned the phones and the researchers collected traces on each phone once more. They discovered DNA that belonged to the phone’s owner on each of the phones.

Surprisingly, DNA was even picked up immediately after the phones were cleaned. That suggests that washing won’t remove all traces of evidence from a criminal’s cellphone. So cellphones can be added to the list of clues that can settle a crime-scene investigation.

64. In a crime-scene investigation, now experts are likely to turn to ________.

A. the criminal’s fingerprint B. the DNA analysis of physical items

C. the detectives D. the criminal’s cellphone

65. According to the passage, McFadden was inspired by ________.

A. the secrets stored in people’s cellphones B. the special characters of DNA

C. a cellphone-involved case D. the challenging job of detectives

66. According to the passage, the potential application of the new study would be ________.

A. identifying criminals B. designing new cellphones

C. protecting individual privacy D. preventing cellphone-involved crimes

67. Which of the following has the closest meaning with the underlined word “identify” in Paragraph 2?

A. imagine B. recognize C. discover D. determine

64.B 65.C 66.A 67.B

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书面表达（满分30分）

Global Shortage of Fresh Water

1）有人认为淡水是取之不尽的。（雨水、河水、井水、地下水）

2）实际上淡水是非常紧缺的。（人口增加、工业用水增加、污染、干旱）

3）提出解决问题的办法。

注意： 1. 词数：120字左右。

2. 卷面整洁分：2分

3. 注意语篇连贯，可根据需要增减括号中的内容。

—The village________we visited yesterday is very beautiful.

—Yes, it’s the place________I grew up.

A．where; where B．which; which C．which; where D．where; which

No equipment previded by the company is so advanced as ________ listed in the product introduction.

A. what B. one C. that D. such

四、阅读理解（10小题，每题2分，共20分）

The largest earthquake (magnitude 里氏9.5) of the 20th century happened on May 22, 1960 off the coast of South Central Chile.

It generated(生成) one of the most destructive Pacific—wide tsunamis(海啸). Near the generating area, both the earthquake and the tsunami were very much destructive, particularly in the coastal area from Concepcion to the south end of Isla Chiloe. The largest tsunami damage occurred at Isla Chiloe--- the coastal area closest to the epicenter(震中). Huge tsunami waves measuring as high as 25 meters arrived within 10 to 15 minutes after the earthquake, killing at least two hundred people, sinking all the boats, and flooding half a kilometer inland.

There was large damage and loss of life at Concepcion, Chile’s top industrial city. Near the city of Valdivia, the earthquake and following aftershocks generated landslides which killed 18 people. At the port city of Valparaiso, a city of 200,000, many buildings collapsed. A total of 130,000 houses were destroyed---one in every three in the earthquake zone and nearly 2,000,000 people were left homeless.

Total damage losses, including to agriculture and to industry, were estimated(估计) to be over a half billion dollars. The total number of deaths related with both the tsunami and the earthquake was never found accurately for the region. Estimates of deaths reached between 490 to 5,7002 with no distinction(差别) as to how many deaths were caused by the earthquake and how many were caused by the tsunami. However, it is believed that most of the deaths in Chile were caused by the tsunami.

61. What is generally thought the main cause of deaths in Chile?

A. landslides B. the tsunami

C. aftershocks D. the magnitude 9.5 earthquake

62. What is the total number of deaths in the earthquake?

A. 2,000,000 B. between 490 to 5,7002 C. 200,000 D. it was hard to know

63. What does the underlined word “collapsed” probably mean?

A. was destroyed B. caught fire C. was flooded D. sank

第四部分：阅读理解（共15小题；每小题2分，满分30分）

阅读下列短文，从每题所给的（A、B、C和D）中，选出最佳选项

A car needs gas to run and your body also needs food to work for you. Eating the right kind of food is very important. It can help your body grow strong to take care of what you eat.

There are four main food groups altogether. The dairy group has food like milk, cheese and sour milk（酸奶）. The other three groups are the meat and fish group, the fruit and vegetable group, and the bread and rice group. Each meal should have at least one food from all four main groups. With all these food together, you will be given enough energy during the day.

It is easy to get into bad eating habits. You may eat your breakfast in a hurry to get to school on time. Or you may not have time for a good lunch. It may seem easy to finish your supper with fish and chips all the time. But you will find yourself tired in these days and you can not think quickly.

Watching what you eat will help keep your body healthy and strong. It is also good to take some exercise. It will help you eat more if you take a walk or play games in the open air. Having a good eating habit with some exercise is the key to your health.

56. Which of the following is a good eating habit?

A. Going to school without any breakfast

B. Eating fish and chips for supper all the time..

C. Having at least one food from all four groups each meal.

D. Having different food from all four food groups.

57. In this passage the writer mainly tells us that _____.

A. every person needs food to grow well

B. taking exercise can keep your body strong

C. the right kind of food with exercise will keep you healthy

D. enough energy helps people think more quickly

58. The underlined word “dairy” in the second passage means _____.

A. the food made out of cows such as milk and butter

B. she shop that sells milk and butter

C. a farm where cows are kept

D. a place where milk products are made.

59. The best title for this passage is _____.

A. The Four Food Groups B. A Healthy Diet

C. Your Body And Food D. Food And Your Health

Recently, a team of eight medical experts has arrived in Shanxi Province to help to__________the latest vaccine incident.

A．look at B．look into C．look through D．look on

________ fun it is to jump into a pool or go swimming in summer!

A. What a B. How C. How a D. What

第三部分：阅读理解（共20小题，每小题2分，满分40分）

My family couldn’t afford to send me to school when I was 16. When my mother took me out of school, I really lost heart about my life and didn’t know what I was going to do.

I worked to help my mother sell newspapers and that was all I could do at the time. When I was 18 years old, my mother started telling me that I would have to live on my own. I felt very frightened of the future. One night while I was watching television, a piece of news about joining the army caught my eyes. I had admired soldiers since I was very young. Now the chance came and I felt pleased. The next day I called the number on the news and set up an appointment to meet the recruiter(征兵人员), an elderly officer. When he heard that I didn’t graduate from high school, he told me that I had a slim(微小的) chance. I explained to him that I would study to improve myself and work hard. At last, he agreed to try to help me.

About a month later he asked me to go to his office and explained to me that he would get me in the service（服役） but I had to promise him that I would make the best of this chance he was trying to create for me and I did. He was able to help me join the army and I kept my promise by doing eight years and receiving an Honorable Discharge (光荣退伍证) from the service. After that, I have worked as a guard with good pay.

56. Why did the author drop out of high school?

A. Because he wanted to help his mother.

B. Because his mother wanted him to work.

C. Because he lost interest in study.

D. Because his family was too poor.

57. When the author got out of school, he felt _______.

A. relaxed B. hopeless C. bored D. frightened

58. How did the author succeed in joining the army?

A. Through his mother’s encouragement and his luck.

B. Through his great performance before the recruiter.

C. Through his sincere(真诚的) request and an officer’s help.

D. Through his optimistic attitude and serious promise.

59. We can infer from the text that _________.

A. people can achieve success if they don’t give up

B. a person’s achievements depend mainly on other’s help

C. failure in one field doesn’t mean failure in another

D. people should be confident in the face of difficulties

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