Have you ever heard a news reporter talk about DNA? Reporters talk about DNA found at the scene of a crime. They talk about police finding DNA “fingerprints.” Police sometimes use DNA as a clue to find out who committed the crime.
DNA is a substance（物质） that makes up genes. Everything alive has genes. Plans have genes. Animals have genes. Yo
u have genes.
Genes are the basic units of heredity（遗传）. Heredity means all the characteristics you inherit from your parents. You get your genes from your parents. You inherit half of your genes from your mother. You inherit half of your genes from your father.
Genes are a kind of code. A tree’s genes tell w
hat shape its leaves will be. A cat’s genes tell what color its fur will be. Your genes tell what color your eyes will be. Your genes tell what color your hair will be. Everything about you co
mes from the code in your genes.
Genes line up on strands（链） called chromosomes（染色体） in cells. Everything alive is made up of cells. Chromosomes are in the center, or nucleus, of cells.
Different parts of you are made of different kinds of cells. Your muscles are made of muscle celIs. Your skin is made of skin cells. The code in your genes tells your body to make different kinds of cells. The genes in each cell tell the cell how to work. They tell the cell when to make new copies of itself.
An Austrian monk named Gregor Mendel first saw inherited patterns in pea plants. He experimented with pea plants in the 1860s. One of the things, or traits（特质）， Mendel studied was what makes some pea plants tall and some short. He said that the traits must come from units of heredity passed from the parent plants. These units were later called genes.
In the mid-1900s, scientists discovered that genes are made of DNA. In the 1970s, scientists learned how to change DNA with genetic engineering. Scientists also learned that problems with certain genes cause diseases. Muscular dystrophy, cystic fibrosis, and hemophilia are some genetic diseases-diseases caused by problems in genes. Today, scientists are looking for ways to cure genetic diseases by changing genes through a process called gene therapy. What is DNA?
| A．DNA is a kind of gene. |
| B．DNA is a substance that makes up genes. |
| C．DNA is the basic unit of heredity. |
| D．DNA is a measure to protect crime. |
Which of the following about genes is correct according to the passage?
| A．Plants, animals and human beings have the same genes. |
| B．Half people inherit all genes from their mother, others from their father. |
| C．Genes decide the trees shapes, the cats’ fur color and our eyes’ color as well. |
| D．Genes will give you a code when you need them. |
Where are genes?
| A．Genes lining up on strands called chromosomes are in the center of cells. |
| B．Genes hide in everything alive in your body. |
| C．Genes can be nowhere but in your mind, controlling all your actions. |
| D．Genes travel in your body and help cope skin, muscle, and eyes. |
An Austrian monk named Gregor Mendel .
| A．first saw inherited patterns in people |
| B．was interested in why plants were different |
| C．first called the units of heredity from parents genes |
| D．was the first who discovered genes |
We can conclude that .
| A．scientists were less intelligent than monks in 1900s |
| B．some genes are bad and can cause diseases |
| C．we don’t need to worry about genetic diseases any longer |
| D．the discovery of genes may be of great help in our daily life |
Two students started quarreling at school. One student shouted dirty words at the other, and a fight began. What can be done to stop fights like this at school? In some schools, the disputants sit down with peer mediators(同龄调解者). Peer mediators are students with special training in this kind of problems.
Peer mediators help the disputants to talk in a friendly way. Here are some of the ways they use:
1) Put what you think clearly but don’t say anything to hurt the other. Begin with “I feel…” instead of “You always…”
2) Listen carefully to what the other person is saying. Don’t stop the other person’s words.
3) Keep looking at the other person’s eyes when he or she talks.
4) Try to see the other person’s side of the problem.
5) Never put anyone down. Saying things like “You are foolish” makes the talk difficult.
6) Try to find a result that makes both people happy.
Peer mediators never decide the result or the winner. They don’t decide who is right and who is wrong. Instead, the disputants sit down with peer mediators(同龄调解者) The underlined word “disputants” refers to the students ________.
| A．who make peace | B．who give in |
| C．who are lazy | D．who quarrel |
When there is a fight at school ________.
| A．the peer mediators decide who the winner is |
| B．the peer mediators and the disputants talk together |
| C．the students who quarrel decide who the winner is |
| D．the two students sit down and listen to the peer mediators |
Peer mediators’ work is ________.
| A．to give lessons to disputants |
| B．to find out who starts a quarrel |
| C．to give students some special training |
| D．to help find a way to make both sides happy |
Which of the following ways is not used by Peer mediators in finding a “win-win” result?
| A．Listen carefully to what the other person is saying. |
| B．Try to see the other person’s side of the problem. |
| C．Never say things like “You are foolish” |
| D．Never keep looking at the other person’s eyes when he or she talks. |
In the past ten years, many scientists have studied the differences between men and women. And they all got the same answer: The sexes(性别) are different, because their brains are different. And this, the scientists say, makes men and women see the world in different ways.
Boys, for example, generally are better than girls at mathematical ideas. Boys also generally are better than girls at the kind of hand and eye movements necessary for ball sports. Girls, on the other hand generally start speaking earlier than boys. And they generally(通常) see better in the dark than boys and are better at learning foreign languages.
What makes men and women better at one thing or another? The answer is the brain. The brain has two sides connected by nerve(神经) tracks. The left side generally is used for mathematics, speech and writing. The right side is used for artistic creation(创造) and the expression for emotions(情感). In men and women, different areas in each side of the brain develop differently. In boys, for example, it’s the area used for mathematics. In girls, it is the area used for language skills. Another interesting difference is that the two sides of a man’s brain are connected by a smaller nerves than the two sides of a woman’s brain are. Which of the following is best to outline(概括) the article?
| A．Research on the brain. |
| B．Differences between men and women |
| C．People’s different brains. |
| D．Who Are Better, Boys or Girls |
________men and women think differently.
| A．Sex makes. |
| B．The different brains make |
| C．The different experiences make. |
| D．The influences of society make. |
According to the article, girls are generally better than boys at __ in your school.
| A．mathematics | B．physics |
| C．English | D．Chemistry |
Which of the following is true?
| A．The right side of brain in boys generally develops better than that in girls. |
| B．The left side of brain in girls generally develops better than that in boys. |
| C．Men are better than women in all things. |
| D．The area in girls’ brain used for language skills develops better. |
Retirement is the point where a person stops employment completely. The “standard” retirement age varies from country to country, but it is generally between 50 and 70. However, for a long time, people have got into an argument about whether the age of retirement should be increased or reduced in their own countries.
There are several arguments for allowing older people to continue working as long as they are able. Many people think that older employees have a large amount of knowledge and experience which can be lost to a business if they are made to retire. Besides, older employees are often extremely devoted employees and are more willing to implement company rules than the young. A more important point is regarding the attitudes in society to old people. To force someone to resign or retire at 60 or 65 indicates that the society does not value the input of these people and that their useful life is over.
Allowing older people to work indefinitely (无限地), however, is not always a good policy. Some people took the strong view that age alone is no guarantee of ability. Many young employees have more experience or skills than older staff, who may have been stuck in one area for most of their working lives. On the other hand, older people should be rewarded by society for their life’s labor by being given generous pensions and the freedom to enjoy leisure. They can have time to do whatever they like, that is, they can have their own plans and achieve their retirement goals.
With many young people unemployed or frustrated in low-level positions, there are often calls to compulsorily retire older workers. However, this can affect the older individual’s freedom and right to work. In my opinion, giving workers more choices over their retirement age will benefit society and the individual.What does this passage mainly talk about?
| A．How to set a standard of the retirement age. |
| B．More opportunities should be given to young people. |
| C．Companies should make full use of old people’s wisdom. |
| D．Opinions about retirement age are different among people. |
Some people think older people should go on with work because ______.
| A．they have a sense of achievement |
| B．they want to learn more knowledge |
| C．they have grasped much practical experience |
| D．they will help the business not to fail quickly |
The underlined word “implement” in Paragraph 2 probably means “______.”
| A．take over | B．carry out |
| C．get rid of | D．set aside |
Which point of view may the author agree to?
| A．Older people are encouraged to retire on time. |
| B．Older people would like to do something else. |
| C．Older people’s experience should be valued. |
| D．Older people can choose whether to work on or not. |
Werewolves (狼人) aren’t the only creatures(生物) affected by the moon’s cycles. A full moon slightly affects people’s sleep, reports a Swiss team of scientists. Even people’s sleep in a lab without windows experienced a small shortfall in sleep once a month.
To test the moon’s effect, 33 adult volunteers of both sexes and various ages spent several nights in a sleep lab. As they slept, researchers recorded their brain activity, eye movements and hormone (荷尔蒙) levels. On nights closer to a full moon, the subjects took an average of five minutes longer to fall asleep, and slept for 20 minutes less. In addition, brain activity decreased by 30 percent during the sleep stage that the brain normally uses to recover from its daylight work. And levels of hormone that help control sleep cycles dropped. On these nights, the sleepers complained of poor sleep quality even though they were unaware of the moon’s cycle. On the bright side, not a single participant turned into a werewolf.
The Swiss team doesn’t know how the moon affects sleep. The gravity (重力) of the moon causes ocean tides to rise and fall. But that force is too weak to affect sleep, Gajochen says. He believed some body’s biological clock may be tied to the moon cycles. There may be another explanation, says David Dinges. This sleep researcher at the University Of Pennsylvania in Philadelphia says that the body clock is very sensitive to light at night. Volunteer’s sleep could have been affected by exposure to extra moonlight before arriving at the lab.The writer mentioned “werewolves” in the first paragraph to ______.
| A．prove that the moon’s cycles exist |
| B．draw people’s attention to the report |
| C．introduce a similar creature to readers |
| D．warn people not to sleep alone in the lab |
What happened to the volunteers during the experiment on a full moon?
| A．They slept for about five minutes longer. |
| B．Their brains never recovered from their work. |
| C．They complained they were too tired to sleep. |
| D．Their brains were not so active as they were |
The last paragraph is developed mainly by ______.
| A．analyzing causes | B．explaining differences |
| C．making comparisons | D．following the time order |
The passage is mainly about ______.
| A．the sleeping problems caused by the moon’s cycles |
| B．the influence of the moon on human sleeping habits |
| C．the moon’s effect on sleeping and its possible reasons |
| D．the ways to improve sleep quality on a full moon night |
His youth was nothing like yours, unless your name happens to be Justin Bieber or Emma Watson. At 14, Kirk Cameron was receiving 10,000 letters a month while acting as Mike Seaver in the sitcom (情景喜剧) Growing Pains. For children of the 1980s, every boy dreamt of having his brown leather coat, the modern parents, and the humor of Mike Seaver.
Kirk was making $ 50,000 a week but had to deal with various things resulting from increasing popularity. “Kirk had a couple of ardent fans who followed and shadowed him. They kind of crossed the line and frightened all of us to some degree,” says another star of the sitcom.
In 1986, the kid described his life to a magazine: “I’m just going to have to get used to the uncomfortable parts, like not having a lot of privacy. Interviewer wants to know if being famous is making me breathless and I answer no, it isn’t—it is a lot, but I can handle (处理) it.” However, people considered him the happiest guy on the planet. He was driving around the city in his favorite car. He flew to foreign countries for vacations. He tasted various foods in different restaurants on streets.
In a recent interview, Kirk admitted that he once viewed the world as though he were the centre of it and began expecting things to be done for him. “Anything I wanted was given to me. That was what I expected because that was my reality,” he says. Though it was not easy for Kirk, he managed to treat himself as an ordinary person, with years of life experience.The underlined word “ardent” in Paragraph 2 probably means ______.
| A．crazy | B．patient |
| C．angry | D．lost |
Kirt Cameron was thought to be the happiest guy because of ______.
| A．his high income | B．his popularity |
| C．his life style | D．his great dreams |
What does Kirt Cameron think of the early himself?
| A．Humorous. | B．Self-centered. |
| C．Ordinary. | D．Happy. |
What might be the best title for this passage?
| A．Live a Free Life as You Wish |
| B．A Hard Life Lacking in Privacy |
| C．To Be Ordinary Though Famous |
| D．Annoying Popularity with Troubles |