It hasn’t been ______ that food from cloned a...

It hasn’t been ______ that food from cloned animals is really safe for humans to eat.

A. confirmed　　　　　　 B. considered

C. turned out　　　　　 D. proved

高二英语单项填空中等难度题查看答案及解析

The Food and Drug Administration is, again, threatening to impose(征税) milk and meat from cloned animals on a public that opposes the technology and its products.

Respected polls report that more than 60% of Americans think animal cloning is immoral, and that most people said they wouldn’t knowingly eat the products even if the FDA approved them. But because the FDA would allow cloned meat and milk to be sold without identifying labels, consumers wouldn’t be able to avoid them. The FDA has consistently tilted toward those who want cloned milk and meat in our food. Agency officials have repeatedly asserted that science shows cloned milk and meat are safe for humans. But the FDA has never published the complete scientific studies it says support that claim.

The argument that cloning is safe for animals is unconvincing. Cloned meat and milk offer no public economic benefits. Having cloned cows produce more milk wouldn’t reduce milk prices. US farmers produce more milk than we drink, and the government is required to buy the surplus. Since 2000, dairy support programs have cost taxpayers more than $ 5 billion.

Most important, this first decision to advance animal biotechnology raises ethical issues beyond the FDA’s expertise（专家意见）. Techniques used to clone animals will advance the ability to clone humans－and create animals with human genes. Neither the agency nor animal scientists are qualified to tell us whether and when it is ethically acceptable for humans to alter the essential nature of animals. We need a national discussion, including ethicists and religious leaders, to consider the wisdom of cloned and transgenic animals. Given the risk of unintended consequences, we should proceed cautiously. The president should halt further FDA action on cloning and set in motion(运作) a process for beginning this broader discussion.

1. The author’s attitude towards cloning is __________.

A. standing in the middle      B. opposed     C. approving      D. supportive

3. In US many people buy cloned foods __________.

A. to support the new technique

B. because FDA approved them

C. because they cannot tell which is cloned food

D. because they cannot read the labels.

3. From the text we know that cloning technique ___________.

A. developed well enough to clone human beings

B. may cause unintended bad results to human beings

C. will bring more unexpected economic benefits

D. is supported by ethicists and religious leaders

4. What’s the best title of this passage?

A．Public Is Against Cloned Food     B．Benefits of Cloned Food

C．Cloned Food Is Illegal             D．Technique in Cloned Food

高二英语阅读理解简单题查看答案及解析

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

It is the first time that Martin has been to the South Pole, ________?

A. isn’t he         B. hasn’t he          C. isn’t it         D. hasn’t it

高二英语单项填空简单题查看答案及解析

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

It never occurred to humans until the mid-1990s          some animals can be cloned.

A. where    B. that             C. when         D. what

高二英语单项填空中等难度题查看答案及解析

It never occurred to humans until the mid-1990s ______ some animals can be cloned.

A. where                B. that                 C. when                 D. what

高二英语单项填空中等难度题查看答案及解析

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

From the moment that an animal is born it has to make decisions. It has to decide which of the things around it are for eating, and which are to be avoided; when to attack and when to run away. The animal is, in fact, playing a complicated and potentially dangerous game with its environment, discomfort or destruction.

This is a difficult and unpleasant business and few animals would survive if they had to start from the beginning and learn about the world wholly by trial and error, for there are too many possible decisions which would prove fatal. So we find, in practice, that the game is always arranged in favor of the young animal in one way or another. Either the animal is protected during the early stages of its learning about the world around it, or the knowledge of which way to respond is built into its nervous system from the start.

The fact that animals behave sensibly can be attributed partly to what we might call genetic learning, to distinguish it from individual learning that an animal does in the cause of its own life time. Genetic learning is learning by a species as a whole, and it is achieved by selection of those members of each generation that happen to behave in the right way. However, genetic learning depends upon a prediction that the future will more or less exactly resemble the past. The more variable individual experience is likely to be, the less efficient is genetic learning as a means of getting over the problems of the survival game. It is not surprising to find that very few species indeed depend wholly upon genetic learning. In the great majority of animals, behavior is a compound of individual experience added to the action patterns animals are born with．That is why animals can survive．

1.The survival game is considered complicated and potentially very dangerous because ________.

A. decisions made by animals may prove fatal

B. animals are often in danger of being attacked

C. animals make decisions entirely by trial

D. environment is not fit for animals to survive

2.Most animals survive because they can make right decisions by ________.

A. a series of trials and errors

B. knowledge obtained in their life time

C. the nervous system

D. genetic learning and individual experience

3.Concerning the relationship between genetic learning and individual experience, which of the following is right?

A. They develop side by side.

B. They are contradictory, but individual experience is the dominant.

C. Genetic learning is likely to function more if the environments don’t vary much.

D. Genetic learning is more efficient than individual experience.

4.“Genetic learning” refers to ________.

A. learning after an animal is born

B. learning obtained by some members of each generation who happen to behave properly

C. learning gained by all the members in a species

D. learning gained by young animals from their experience

5.What cannot be inferred from the article?

A. The majority of animals depend thoroughly upon genetic learning.

B. Animal behave in particular ways as a result of both individual experience and genetic learning.

C. If animal depended wholly upon individual experience, its chance of survival would be little.

D. Genetic learning depends on the assumption of resemblance between the future and the past.

高二英语阅读理解中等难度题查看答案及解析

It is in their ability to speak ______ humans ______ from animals.

A. which; differ     B. that; different      C. which; different       D. that; differ

高二英语单项填空中等难度题查看答案及解析