Children are natural scientists, very interested in the world around them. Helping them enjoy science can be easy; there’s no need for a lot of scientific terms（科学术语）or modern labs. You only have to share your children’s interests.

Firstly, listen to their questions. I once visited a classroom of seven-year-old children to talk about science as a job. The children asked me “textbook questions” about schooling, the money I got and whether I liked my job. When I finished answering, we sat facing each other silently. Finally I said, “Now that we’ve finished with your lists, do you have questions of your own about science?”

After a long wait, a boy put up his hand, “Have you ever seen a grasshopper(蚱蜢) eat? When I try eating leaves like that, I get a stomachache. Why?” This began a lot of questions that lasted nearly two hours.

Secondly, give them time to think. Studies over the past 30 years have shown that, after asking a question, many teachers usually wait only one second or less for an answer, no time for a child to think. When teachers increase their “wait time” to three seconds or more, children give better answers.

But in talking about science, these words make a child think that the discussion is over. Instead, keep things going by saying, “That’s interesting” or “I’ve never thought of it that way before”, or coming up with more questions or ideas.

Lastly, show; don’t tell. Let children look at their hands through a microscope（显微镜）, and they’ll understand why you want them to wash before dinner….

36. To help children enjoy science, the most important thing for teachers to do is ___________.

A. let them see the world around            B. let them study in modern labs

C. tell them the difficult terms on science D. share the children’s interests

37. In the last sentence of the second paragraph, the words “your lists” mean ____________.

A. your answers to the questions            B. your own questions about science

C. your questions from textbooks            D. all the questions of your own

38. According to the passage, children can give better answers to the questions if teachers ____.

A. ask them to answer quickly            B. wait for one or two seconds after a question

C. tell them to watch their language    D. wait at least three seconds after a question

39. The writer talks about all of the following ways except that teachers should ____________.

A. tell their children stories instead of telling them to remember facts

B. offer their children chances to see things for themselves

C. allow enough time for their children to find answers to the questions

D. encourage their children to ask questions of their own

40.  The writer of the passage is probably ____________.

A. a teacher                                B. a scientist   

C. a seven-year-old boy’s father           D. a reporter

Children are natural scientists. They are interested in looking into the world around them. Helping them enjoy science can be easy; there’s no need for a lot of expensive lab tools. You only have to share your children’s curiosity(好奇).

Firstly, listen to their questions. I once visited a classroom of seven-year-old students to talk about working as a scientist. The children asked me questions about schooling and whether I liked my job. When I finished answering, we sat facing one another quietly. Finally I said, “Now that we’ve finished, do you have questions of your own about science?”

After a long pause, a boy put up his hand, “Have you ever seen a grasshopper(蚂蚱) eat? When I try eating leaves like that, I get a stomachache. Why?” This began a set of questions that lasted nearly two hours.

Secondly, give them time to think. Studies have shown that, after asking a question, adults usually wait only one second or less for an answer, do not leave time for children to think. When adults increase their “wait time” to three seconds or more, children can give more logical(合逻辑的), complete and creative answers.

Thirdly, watch your language. Once you have a child telling his idea in a science discussion, don’t jump in with “That’s right. ” or “Very good. ”. These words work well when it comes to encouraging good behavior. But in talking about science, quick praise can mean that discussion is over. Instead, you can say “That’s interesting. ” or “I’d never thought of it that way before. ” or come up with more questions or ideas.

Never push a child to “Think”. Children are always thinking, without your telling them to. What’s more, this can turn a conversation into a performance. The child will try to find the answer you want in as few words as possible, so that he will be a smaller target(目标)for your disagreement.

Lastly, show; don’t tell. Real-life feeling of nature is far more exciting than any lesson children learn from a book. Let children look at their fingertips(指尖) through a magnifying lens(放大镜), and they’ll understand why you want them to wash before dinner.

(   )53. When children are in a science discussion, adults should ________.

A. speak highly of the children.

B. praise the children immediately

C. end up their discussion with “That’s interesting”

D. leave time for them to come up with better ideas

(   )54. What does “this” refer to in the 6th paragraph?

A. Pushing children to think.

B. Finding the answer you want.

C. Talking about science.

D. Telling children to discuss.

(   )55. These are the ways for adults to share children’s curiosity EXCEPT ________.

A. telling them encouraging stories instead of boring facts  

B. offering them chances to see things by themselves

C. being patient when the children answer questions     

D. persuading them to ask the questions of their own

  

CELL phones help us easily find people anywhere at any time. A cell phone can include many things, such as games, music and Internet access. Today, 4.6 billion people around the world have cell phones, according to CBS News.
    However, cell phones may cause cancer（癌症）, according to the World Health Organization. In a 2010 study, people who used a cell phone for 10 years or more were more than two times as likely to get cancer, according to CNN.
    The following suggestions may help you reduce your risk of cancer:
    1. Use a headset（头带式耳机）or speaker
    Headsets give out much less radiation（辐射）than phones. Some wireless（无线的）headsets give out low-level radiation. However, you should take it off your ear when you’re not talking to anyone. Using your phone with a speaker will also make it safer.
    2. Listen more, talk less

Your phone gives out radiation when you talk or text, but not when you’re listening or getting messages. Listening more and talking less can lower the risk of cancer.
    3. Hold the phone away from your body

 Hold the phone away from your body when you’re talking, not against your ear. Also, don’t keep it in your pocket.
    4. Choose texting over talking
    Phones emit（发出）less radiation to send texts than to carry a person’s voice. Texting also keeps radiation away from your head.
    5. Poor signal? Stay off the phone
    Fewer signal bars on your phone mean that the phone needs to give out more radiation to work. Make and take calls when your phone has a strong signal.

47. According to CBS News, _____ people all over the world have got cell phones.

A. 460 thousand      B. 4.6million              C. 4.6 billion              D. 46 billion

48. From Paragraph 1, we know that _____.

A. cell phones have three new ways         B. people can do nothing without cell phones

C. it’s dangerous to use cell phones too much

D. cell phones help us a lot and many people use them

49. How many suggestions to reduce cancer are mentioned in this passage?

A. Five.             B. Four.                   C. Three.               D. Six.

50. The passage mainly talks about ______.

A. the development and advantages of cell phones                          

B. the reason why cell phone radiation causes cancer

C. the best ways to use cell phones to communicate                    

D. how to protect ourselves from cell phone radiation