Cloning an animal is a complex ________ that ...

Cloning an animal is a complex ________ that can go fatally wrong at any stage.

A. process      B. regulation       C. step             D. method

高二英语单项填空中等难度题查看答案及解析

Cloning plants is straightforward ________ cloning animals is very complicated .

高二英语单项填空简单题查看答案及解析

All efforts of cloning an animal will be ________ if there is not enough diversity in the group to overcome illness.

高二英语单项填空中等难度题查看答案及解析

As a middle school student, you are in an age group that is both fascinating and complex. You are no longer a “baby”, but you are not yet an adult. You are experiencing biological, physical, and behavioral and social changes. Relationships with your friends and family take on new meanings. This time period, called adolescence, can be joyful and painful at the same time. However, it is always a time of growth. You will be dealing with more complex intellectual tasks. You will be expected to behave in a more mature manner and you will be held more responsible for your actions. In other words, you are growing up. Use your curiosity, imagination, energy, and idealism to make your school an exciting place to learn and play.

As an adolescent, you now have more control over how you apply yourself to your school work and on the kinds of friends you make. As an intelligent and thinking adolescent, be aware of health risks to avoid such as involvement with drugs, alcohol, tobacco, and sexual activity. This involvement reduces your quality of life. Be kind and gentle to yourself, seek the advice and wisdom of your parents/guardians regularly, and talk with your teachers and school counselor.

Middle school students are expected to be respectful and considerate of others. You are responsible for your behavior. Think of ways to improve your behavior

△in your classroom

△in the lunchroom

△on school grounds

△during school activities

△on the school bus

△in your community

If you need assistance in working on ways to improve yourself as a person, contact your counselor. The counselor is trained to help students solve personal problems.

1.A middle school student is considered to be a(n) ______.

A. baby　　 B. adolescent　　 C. adult　　 D. wiser

2.Which of the following statements is NOT true according to the passage?

A. Being a middle school student can be painful and joyful at the same time.

B. Middle school students are expected to behave in a more mature manner.

C. Curiosity and imagination are to be considered part of middle school life.

D. It’s hoped that middle school students will improve their behavior after school.

3.What are middle school students warned of in the passage?

A. Dealing with more complex tasks.

B. Applying themselves to their school work.

C. Involvement with drugs or alcohol.

D. Association with their parents or teachers.

4.What is a school counselor responsible for according to the passage?

A. Management of everything at work.

B. Assisting students with their problems.

C. Control of students’ issues in study.

D. Contact between students and parents.

高二英语阅读理解中等难度题查看答案及解析

As we all know, ____________ cloning is the creation of cells or the whole animals using DNA from ____________ single “parent”.

A. the; a　　 B. a; a

C. /; a　　 D. /; the

高二英语单项填空中等难度题查看答案及解析

Animals can move from place to place, but plants cannot. When an animal is under attack, it can run away or fight back. Plants certainly cannot run away, and they lack teeth and claws. But plants can defend themselves by using both physical and chemical means.

Some plants have their own ways to keep animals away. For example, the leaves of the holly plant have sharp spines(刺) that discourage grass-eating animals. Holly leaves on lower branches have more spines than leaves on upper branches. This is because the lower leaves are easier for most animals to reach.

Some plants , such as the oak trees, have thick and hard leaves that are difficult for animals to eat. Some grasses may contain a sandy material; eating such grasses wears down the animal’s teeth.

Many plants also have chemical defenses. Some plants produce chemicals that taste bitter or cause an unpleasant reaction. Some plants may fight against an attack by increasing the production of these chemicals. When a caterpillar(毛虫)bites a tobacco leaf, the leaf produces a chemical messenger. This messenger sends to the roots the information to produce more nicotine. The higher levels of nicotine discourage the caterpillar.

Many plants depends on both physical and chemical defenses. A certain plant in China , for instance, has prickly(多刺的) leaves, and each prickle contains poisonous venom(毒液). A single experience with this kind of plant will teach an animal to stay away from it in the future.

1.The holly plant has more spines on the lower leaves because most animals ________.

2.To defend themselves , oak trees use ________.

3. How does tobacco protect itself against an attack from a caterpillar?

4.What would be the best title for this passage?

高二英语阅读理解中等难度题查看答案及解析

Animals can move from place to place, but plants cannot. When an animal is under attack, it can run away or fight back. Plants certainly cannot run away, and they lack teeth and claws. But plants can defend themselves by using both physical and chemical means.

Some plants have their own ways to keep animals away. For example, the leaves of the holly plant have sharp spines (刺) that discourage grass-eating animals. Holly leaves on lower branches have more spines than leaves on upper branches. This is because the lower leaves are easier for most animals to reach.

Some plants, such as the oak tree, have thick and hard leaves that are difficult for animals to eat. Some grasses may contain a sandy material; eating such grasses wears down the animal’s teeth.

Many plants also have chemical defenses. Some plants produce chemicals that taste bitter or cause an unpleasant reaction. Some plants may fight against an attack by increasing the production of these chemicals. When a caterpillar (毛虫) bites a tobacco leaf, the leaf produces a chemical messenger. This messenger sends to the roots the information to produce more nicotine. The higher levels of nicotine discourage the caterpillar.

Many plants depend on both physical and chemical defenses. A certain plant in China, for instance, has prickly (多刺的) leaves, and each prickle contains poisonous venom (毒液). A single experience with this kind of plant will teach an animal to stay away from it in the future.

1.The holly plant has more spines on the lower leaves because most animals________.

A．are not tall enough             B．like the lower leaves only

C．are not clever enough           D．can get the lower leaves easily

2.To defend themselves, oak trees use________.

A．chemical means B．physical means

C．bitter chemicals                 D．sandy materials

3.How does tobacco protect itself against an attack from a caterpillar?

A．Its leaves fight against the attack by physical means.

B．Its roots send a messenger to discourage the caterpillar.

C．Its roots increase the production of nicotine when it is attacked.

D．Its leaves produce poisonous sand to drive the caterpillar away.

4.What would be the best title for this passage?

A．Plants and Animals           B．How Plants Defend Themselves

C．Attacks and Defenses       D．How Animals Eat Plant Leaves

高二英语阅读理解中等难度题查看答案及解析

Animals can be reproduced by technology now; researchers can clone them. A clone is an exact copy of another animal or plant. Scientists have cloned a sheep which they have named Dolly. Researchers took genes from a ewe (母羊) and used them to create a copy (Dolly) of the ewe.

Why are scientists doing this research? One reason is to get information about genes so they can improve our health. They also want to learn how better farm animals can be produced. Cloning is a controversial issue for people. Some people think it is good because this research can help us, but other people think cloning is unacceptable. Some people think it might be possible to save endangered animals by cloning them. Tigers, elephants, and other endangered animals might be saved in this way.

In China, pandas are endangered because they are hunted and they are losing their habitat, so some Chinese scientists want to try to clone pandas to save them from extinction.

I don’t really like the idea of cloning animals, but I don’t think I want panda to become extinct. If the best way to save them is to make cloned pandas, they must be cloned.

I want to live with a lot of animals and nature. I don’t want animals to die out, especially pandas. I think humans must think more about protecting animals and nature. Maybe cloning is the way to save all endangered animals.

1.What is Dolly like?

A. It is like other ordinary sheep we often see.

B. It is a bit like the ewe.

C. It is exactly like the ewe researchers took genes from.

D. It is like a perfect sheep that researchers want to make.

2.What is the technology scientists use to clone animals?

A. They use the technology of animal improvement.

B. they take genes from an animal and use them to make a copy of it.

C. They change the genes of a ewe and then get them improved.

D. They combine advantages of some animals to make a better one.

3.By studying cloning, scientists can____.

A. make copies of many famous people in the world.

B. start a new industry where many more people may find jobs.

C. find ways to feed the whole world.

D. improve our health and produce fine animals.

4.From the passage we can learn that____.

A. people are all for the technology of cloning.

B. only scientists are interested in cloning.

C. people don’t hold the same opinion about cloning.

D. all the people think cloning unacceptable.

高二英语阅读理解中等难度题查看答案及解析

— Cloning can lead to many complicated problems.

— __________. That’s why a lot of people are strongly against it.

A. That’s it　 　　　　 B. Nonsense

C. That’s all right　 D. What a pity

高二英语单项填空中等难度题查看答案及解析

In most people's opinion, the tiger is not an animal that we would ordinarily think of as being chicken. However, one tiger, which lives in an English zoo, turned out to be more cowardly（胆小的）than his keepers could ever have imagined.

Tanvir, a two-year-old Bengal tiger, got stuck at the top of a new 5m-high activity tower in the zoo, after climbing it for the first time.

The wooden tower had been designed to provide mental exercise for Tanvir by testing his ability of dealing with troublesome situations, but after climbing it in just a few seconds, he lost his courage when it came to coming back down. Tanvir went on to spend nearly two days at the top of the tower trying to collect the courage to attempt to get down.

A spokesperson for the zoo said that several days before Tanvir had taken half an hour to get down a lower tower only 1.5m high, and the taller tower had clearly been too much challenging for him.

"Every time he got to the edge, he looked out, put a paw over, and thought, ‘no, I cannot make it!" ’laughed Samantha Cordrey, Tanvir's keeper. In the end Tanvir's hunger defeated his fear, and after almost 48 hours he made his way down. Burying himself in a big meal just like a hungry pig, Tanvir seemed to forget such a shameful experience for a while.

It appears that his experience would not be the worst in Tanvir's life if he continued to act like a chicken. It is not known whether he will take courage to go back up his exercise tower again.

The whole episode（插曲）only serves to show the difficulties faced by zoo staff in creating environments that will improve animals' living ability in enclosed space.

1.When speaking of Tanvir's shameful experience, Samantha Cordrey might feel it was　　　　 .

A. funny　　 B. surprising　　 C. exciting　　 D. unbelievable

2.What made Tanvir get down the 5m-high activity tower at last?

A. The coldness of the weather.　　 B. The direction from his keepers.

C. The sufferings of being hungry.　　 D. The fear of being alone.

3.Why does the author say "this experience would not be the worst in Tanvir's life if..."(Paragraph 6)?

A. Because Tanvir's keepers will design more difficult exercise for him.

B. Because Tanvir is so cowardly that he has little courage to meet greater challenges.

C. Because Tanvir's bad health will bring him much trouble in practice.

D. Because Tanvir is always careless and often causes trouble by accident.

4.The zoo designed the 5m-high activity tower to　　　　 .

A. make Tanvir become brave　　 B. improve Tanvir's performance skills

C. let tourists watch Tanvir better　　 D. improve Tanvir's living ability

高二英语阅读理解中等难度题查看答案及解析