DNA(Deoxyribonucleic acid)is one of the most important discoveries in science. DNA is the plan for the human being.as a blueprint is the plan for building. DNA makes a person look the way he does. A p 题目和参考答案——青夏教育精英家教网—

题目内容

DNA（Deoxyribonucleic acid）is one of the most important discoveries in science. DNA is the plan for the human being，as a blueprint is the plan for building. DNA makes a person look the way he does. A person’s DNA comes from a mixing of his parents’ DNA. That’s why a child looks like his parents. But，besides controlling things such as height and hair color，DNA can also give people diseases. Scientists are now studying DNA to cure（治疗） diseases.

In the seventies, scientists developed a process called recombinant (重新组合) or RDNA. Although it sounds difficult to understand，RDNA simply means taking DNA from one animal or plant and putting it into another. By doing so，scientists can create new beings. In doing so，scientists can better understand DNA, especially what parts of DNA do. After they understand DNA，scientists can begin to cure diseases. Often，the new being created itself will be the cure.

Besides curing diseases，RDNA research can also do other things. For example, scientists in Japan have already created “super-trees”. Trees help humans，because they take CO2, which poisons humans, from the air and turns it into oxygen, which lets humans breathe. “Super-trees” do this too，but do it much faster. As things such as cars and factories have already put much CO2 in the area，“super-trees” are badly needed.

Unfortunately，there is serious danger in RDNA research. Scientists want to create animals to cure old diseases，but these new animals may also create new diseases. It will be a serious problem if the animals escape from the science laboratory and into nature. As these animals are not natural, they may let loose many new powerful diseases.

As a result，RDNA research will create many solutions（解决方案），but it will also create many problems.

1.From the passage, we can know that a boy looks like his parents because .

A. he is son of his parents

B. his parents’ DNA decides his appearance

C. he has received DNA from his father or his mother

D. scientists have put some of his parents’ DNA into him

2.The following statements are true about RDNA research EXCEPT

A. RDNA research will benefit human beings a lot

B. super-trees might be widely planted around the world

C. scientists have not completely understood DNA

D. the research has been stopped because the created animals carry virus (病毒)

3.What does the underlined expression “let loose” in paragraph 4 probably mean？

A. let．．．go free B. get rid of (去除) C. absorb (吸收) D. survive

4.What is the best title for the passage？

A. The DNA Research in Japan

B. A New Way of DNA Research in Japan

C. The Advantages and Disadvantages of RDNA

D. The Causes and Effects of DNA Research

练习册系列答案

相关题目

The concept of a working holiday is fairly simple．It is a vacation which normally lasts for several weeks or even months，during which you divide your time between work and recreation．The typical working holiday includes some manual labor and sightseeing．You can usually get room and board in exchange for a few hours of work．For instance，Australia and New Zealand encourage working holidays by offering one-year visas to people between the ages of 18 and 30．Countries all over the world offer the chances to work or volunteer and live in a new environment．All you need is a return ticket and enough cash to live on．

While some people choose to work in restaurants or hotels，others may do fruit picking which is perhaps the most popular type of work．Be prepared for long working days in the orchard，which may last up to ten hours a day．If you are not ready for this，a more leisurely job with shorter hours is possible，but you will not make as much money．Another option is volunteering in foreign countries．For example，you can work with disabled children in Bolivia and practice your Spanish，research dolphins and whales in Italy，or build schools in rural towns in Ghana．

A working holiday is a great way to broaden your horizons since it gives you the chance to explore a country，practice a new language，and meet people from all over the world．These kinds of adventures sometimes have a really big impact on those who have experienced a working holiday．They often say that it was one of the best memories of their lives．Be aware! Even though some working vacation programs pay，not all of them do sometimes you end up paying to go on working vacation．However，a working holiday can get you off the beaten track and into spots the average tour bus would never go near.

1.What can you get in exchange for a few hours of work?

A. Recreation and money． B. A return ticket．

C. Free transportation． D. Meals and shelter．

2.What’s the second paragraph mainly about?

A. The idea of a working holiday． B. Ways to spend a working holiday．

C. Great places for a working holiday． D. Volunteering in foreign countries．

3.What does “the beaten track” in the third paragraph refer to?

A. Roads in poor condition． B. Broken railway tracks．

C. Routes taken by many tourists． D. Spots where you might get beaten．

4.What does the writer remind readers to do in the last paragraph?

A. Check what you must pay for． B. Meet proper people．

C. Be prepared for adventures． D. Broaden your horizons．

When my kids were small, I started a tradition in our house of giving eight gifts over the course of the eight days of Hanukkah(光明节). I liked the idea of_________a candle every night and giving my children a gift to unwrap to _______. It was easy to go into a toy store and pick up something _______less than $10 each, or even $1 each (at the Dollar Store). My children didn't ask for anything much in particular and they _______whatever they got.

As the years progressed, I _______the tradition of eight gifts for each night of Hanukkah.

But this year, Hanukkah _______something else. My special-needs son decided that he wanted to _______a computer, and it was up to me to buy all the parts of it. When I wouldn't _______that, he decided he wanted a PlayStation. Then Amazon gift cards. Then money. And it became clear that it wasn't going to happen, he got _______.

I keep________him that Hanukkah isn't about greed or materialism. It's about the miracle of an oil lamp that ________for eight days. It's about being________of our heritage. It's about freedom.

But he ________. I know deep down that his obsessions(迷恋) are out of his ________, and definitely out of mine. Having a special-needs child is as________as it gets. Some days are better than others and not all holidays________the way I hope. But despite his unrealistic requests, he's a(n) ________child who is showing me the true meaning of life.

And as we enter a new year and light the ________approaching the time, I welcome his differences ________I learn how to turn negative requests into________ones.

1.A. buying B. donating C. lighting D. drawing

2.A. celebrate B. present C. send D. play

3.A. with B. for C. of D. from

4.A. ate B. threw C. liked D. drank

5.A. held up B. gave in C. handed in D. kept up

6.A. made B. became C. found D. designed

7.A. build B. buy C. use D. watch

8.A. rely on B. learn from C. agree to D. dream about

9.A. calm B. happy C. selfish D. upset

10.A. telling B. warning C. promising D. accusing

11.A. lays B. hangs C. waits D. burns

12.A. tired B. proud C. afraid D. lack

13.A. nodded B. slept C. insisted D. failed

14.A. mind B. sight C. control D. place

15.A. wonderful B. dangerous C. interesting D. challenging

16.A. run out B. break down C. work out D. put down

17.A. strange B. amazing C. bad D. energetic

18.A. candles B. lamps C. torches D. lanterns

19.A. when B. as C. unless D. until

20.A. relative B. possible C. reasonable D. positive

You think you are clever; ________ _________ _________（正相反），I think you are foolish.

They are putting too much carbon dioxide into the atmosphere, which p_____ heat f____ escaping from the earth into space.

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1.每处错误及其修改均仅限一词；

2.只允许修改10处，多者（从第11处起）不计分。

In my mind, I could never fancy how ten second of life could change a person’s view for his whole existence. A few years ago I experience the worst moment in my life. I was driving home that afternoon. Unfortunately, I didn’t make it home as usually because I had a car accident. While I was driving, all of a sudden, but the car in front of me stopped. My car immediately ran into it. Luckily, I wasn’t serious hurt. That accident changed way I drive and they taught me a valuable lesson. I also came to the conclusion which life needs to be treasuring.

假如你是李华，你校国际部即将举行一次主题为“我爱中国古典诗词”的读书活动。你将代表全体学生，在启动仪式上发言。请你根据以下提示，用英文写一篇发言稿。内容包括：

1. 说明活动的目的；

2. 从中国古典诗词的特点的角度，陈述热爱它的理由；

3. 对学习中国古典诗词的认识。

注意：

1. 词数100词左右；

2. 开头已写好，不计入总词数；

3. 可适当增加细节，以使行文连贯。

参考词汇：古典诗词 classical poetry; 押韵 rhyme

Good morning, everyone!

Welcome to our Reading Activity._________________________________________________________

_____________________________________________________________________________________

________________________________________________

Mistakes can be extremely1. (value), but when you try to get others to pay for your mistakes, then you lose the opportunity to learn from them. When something goes wrong, 2. is usually very easy to find someone else to blame, but what does that really accomplish?

Much of the value of mistakes comes from the fact 3. they demand a cost that must be paid. The person who learns the most from a mistake is the person who pays the price for that mistake.

When you make a mistake, the last thing you want to do is run away 4. it. You need to accept it because you can learn a lot from it. The mistake 5. (make) already, so make the most of it. 6. (pay) the price, learn the lesson, and grow that much stronger.

When you make a mistake, don’t look 7. at it long. Remember the reason for it, and then look forward. Mistakes are lessons of 8. (wise). The past cannot be changed. 9. present is still in your power. Take full advantage of your mistakes 10. (achieve) your goals and aspirations.

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(∧)，并在其下写出该加的词。

删除：把多余的词用斜线(\)划掉。

修改：在错的词下划一横线, 并在该词下面写出修改后的词。

注意：1.每处错误及其修改均仅限一词；

2.只允许修改10处，多者(从第11处起)不计分。

As we all know, everyone have a dream. I have dreamed of being a doctor since I entered into the primary school. Nowadays with modern life go rapidly, many people suffer from different kind of diseases, both mentally and physically. As a result, doctors are in great need at home and abroad. My dream is to become successful doctor, helping to save people's lives. Although to be a good doctor was very difficult, I will do whatever I can to keep everyone health. To make my dream come true, I have told me over and over again that I'll concentrate more to studies. After all, only by working hardly can one succeed.

试题分类