D

For more than twenty years scientists have been searching for signs of life on other planets.Most of these searches have been done over the radio.The hope is that someone in outer space may he trying to get in touch with us.Scientists also have sent radio and television messages on spaceships traveling through space, on the chance that someone may be receptive to such messages.

Scientists are using powerful radio telescopes (望远镜) to listen to signals from about 1，000 stars, all within 100 light years of earth.In addition, they will scan (扫视) the entire sky to "listen" for radio messages from more distant stars.Using a computer, they will be able to monitor more than eight channels at one time.Scientists are looking for any signal they stands out from the hack-ground noise.

Of the 200 billion stars in the Milky Way galaxy (银河星系), scientists find that five percent are like our sun.Perhaps half of them have a planet like our earth.Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution of life.Based on the inhabitable( that can be lived in) planets in our galaxy, most scientists agree that chances are likely that one or more of these planets support some life.

However, many scientists wonder whether intelligent life exists on other planets.Some believe that twenty years of searching without any intelligible messages shows that no one is out there.They say that the evolution of intelligence comparable to ours is unlikely.

Other scientists believe that our search hasn't been long enough to rule out the possibility that intelligent life exists in our galaxy.Although our sun family is only about five billion years old, our galaxy is about 20 billion years old.In that time, some scientists think it is likely that civilization (文明)much more advanced than ours have developed.Perhaps these civilizations send us no signals; perhaps we have not recognized the signals they have sent us.If we hope to find intelligent life, these scientists believe that we have to keep looking.

53.According to the passage, how many planets in our galaxy might be inhabitable?

A.5 billion.        B.10 billion. C.15 billion.      D.200 billion

54.The first paragraph in this passage is mainly about ______.

A.how scientists are looking for signs of life on other planets

B.why scientists are looking for signs of life on other planets

C.where scientists are looking for signs of life on other planets

D.when scientists are looking for signs of life on other planets

55.The underlined word "monitor" in the passage means "______".

A.find           B.follow     C.check   D.form

56.Which of these statements is true based on the information in the passage?

A.The earth is one of the oldest planets in our galaxy.

B.Most scientists believe that there is intelligent life on other planets.

C.Scientists are trying different ways to find signs of life on other planets.

D.Scientists don' t believe that there might be life on other planets.

E

How to protect children Web fans from unsuitable material on-line while encouraging them to use the Intel-net has long been discussed in the U.S.

For some parents, the Internet can seem like a jungle, filled with danger for their children.But jungles contain wonders as well as dangers and with good guides, some education, and a few precautions (预防措施), the wilds of the Internet can be safely navigated (航行) ?"Kids have to be online.If we tell our kids they can't have access(机会) to the Internet, we' re cutting them off from their future, " said an expert.

Most kids have started to use search engines.Many of them are great for finding tons of interesting Internet sites, and they can also locate places where you might not want your kids to go.There are search engines designed just for kids.A certain software contains only sites that have been selected as safe.The most popular way to limit access would he to use what is known as a "content screener(过滤器)".But this can' t be wholly reliable(可靠), and the best thing parents can do is to talk to their kids and let them know what is OK or not OK to see or do on the Internet.Another way is that mum or dad is nearby when the child is surfing(浏览) the Internet.

A few other tips

●Don't put the PC in a child' s.room but keep it in an area where mum or dad can keep an eve on things.That also makes the Internet more of a family activity.

●Ask your child what he or she has been doing and about any friends they make on-line.

●Tell your child not to give on-line strangers personal information, especially like address and phone number.

●And tell your children never to talk to anyone they meet on-line over the phone, send them anything, accept anything from them or agree to meet with them unless you go along.

57.The passage is mainly about the subject of______.

A.American children going on-line

B.Internet in America

C.appreciating Internet

D.opposing children's on-line

58.The best way to protect children from improper material is ______.

A.to install (安装) a content screener on the computer

B.to buy some search engines for the children

C.to he nearby when they are surfing the Internet

D.to talk to the children and persuade them to tell right from wrong

59.Which of the following is right according to the passage?

A.Surfing the Internet is the best method of educating children.

B.Children' s not having access to Internet may have effect on their progress.

C.Using a content screener is most reliable for keeping children having access to Internet.

D.Searching engines can help children to select materials fit for them.

60.According to the passage, we can infer that ______.

A.soft wares fit for children want programming

B.a child who is on-line is in danger

C.Internet is a jungle full of danger

D.Internet contains a lot of harmful sites

A

One evening I went out and left my 17-year-old son in charge of his 8-year-old brother and 4-year-old sister. On this occasion, the chore (烦人的事) was made less troublesome by the presence of his girlfriend. I left with complete confidence that the older children would do a wonderful job of babysitting the younger children and the younger children would do a wonderful job of accompanying the older ones. Later, I discovered that complete confidence was the last thing I should have left home with.

I had decided to return home earlier than planned so that my son and his girlfriend could go out. I called home with this happy news. But instead of hearing his cheerful, thankful voice on the other end of the line, all I heard was the sound of a telephone ringing.

It was, I should point out, after 10 p.m., when the two younger children should have been in bed, and when the two older children should have been answering the phone. “I’ll give him a lesson,” I said. I decided they must be outside. Why they might be outside at 10:30 on a wintry night I had no idea, but it was the only explanation I could come up with.

Finally, in desperation, I called his girlfriend’s house. After what seemed like countless rings, his girlfriend answered. “Yes,” she said brightly, “He’s right here.”

He came on the phone. I was not my usual calm, rational self. After all, one of the rules of survival (生存) for modern parents is that you can’t trust modern teenagers. “Where are the children?” I said. He said they were with him. They had done nothing wrong. My son had taken the younger children over to his girlfriend’s house just for ice cream and cake. This was too wholesome (有益的) to be believed. Well, it turns out that I shouldn’t have believed it. It was only part of the truth.

The following Saturday evening we were at my parents’ home, celebrating my birthday. My oldest son gave me the children’s gifts. Mounted and framed (给……装框) were a series of lovely color photographs of my children, dressed in their best clothes, and wearing their most wonderful expressions. They are pictures to treasure a lifetime, all taken by the father of my son’s girlfriend.

That was the most precious gift of all.

41. The author went out and left her eldest son in charge of the younger children because ______.

A. she knew that his girlfriend was a good baby-sitter

B. she could not find a baby-sitter on that winter night

C. the older children and the younger ones would get along well

D. she believed he was old enough to take care of the younger ones

42. Shortly after the author left home one evening, she discovered that ______.

A. she should have taken the children along with her

B. she shouldn’t have completely trusted her son

C. her son had left home with his girlfriend

D. her son had brought his girlfriend home

43. The underlined sentence in paragraph 5 implies that the children not only enjoyed ice-cream but also ______.

A. had a birthday party    B. framed some photographs

C. had their pictures taken    D. showed off their best clothes

44. Which of the following possible titles best expresses the main idea of this text?

A. A Precious Birthday Gift    B. Modern Teenagers

C. Mother and Children    D. An Evening Out

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