题目内容

【题目】【原创】 Are you in a hurry?

—_______. I was supposed to leave for the airport an hour ago.

A. Not at all B. Impossible

C. You bet D. Don’t mention it

【答案】C

【解析】

试题分析:考查情景交际用语。句意为:--你很忙吗?-- …我本该在一个小时前就出发去机场。根据下一句可判断,说话者确实很忙,故选择C,意为你说对了。

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【题目】根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Learn to Think

I will think of it ”. It is easy to say this. _【1】_ We can not see our thoughts, or hear , or taste, or feel them; and yet what mighty power they have!

Sir Isaac Newton was seated in his garden on a summer’s evening, when he saw an apple fall from a tree. __2__ Later , he discovered how the earth , sun moon, and stars were kept in their places.

_3__He began to think; he wanted to find out why the steam in the kettle moved the heavy lid. From that time he went on thinking and think. When he became a man, he improved the steam engine so much that it could, with the greatest ease, do the work of many horses. 4_

A man named Galileo was once standing in the cathedral of Pisa, when he saw a chandelier swaying to and fro. This set him thinking, and it led to the invention of the pendulum.

Boys, when you have a difficult lesson to learn, don’t feel discouraged, and help yourselves before asking someone to help you. _5__

A. But do you know what great things have come from thinking?

B. Think, and by thinking you will learn how to think to some purpose.

C. A boy named James Watt sat quietly by the fireside, watching the lid of the tea kettle as it moved up and down .

D. And do you know how to think?

E. When you see a steamboat , a steam mill, remember that it would never have been built if it had not been for the hard thinking of someone .

F. He began to think, trying to find out why the apple fell.

G. He was a famous physicist and good at thinking.

【题目】【原创】The first theories and experiments with cloning began in the late 1880s as scientist sought to prove their theories about how the genetic material inside cells worked. Discoveries about the nature of DNA in the 1940s made it possible for cloning experiments to progress. In 1944 it was discovered that genetic information for each cell was kept in the cell’s DNA. When Oswald Avery found this genetic information, it gave scientists new ways to try to clone animals by using that genetic blueprint(生物细胞的模型).

The first cloned animals were northern leopard frogs that were cloned by Thomas J. King and Robert Briggs in 1952. King and Briggs believed, based on their clones, that young cells were more practical for the cloning process. Cells that were taken from adults resulted in abnormally developed tadpoles(蝌蚪). The next successful cloning experiments also resulted in cloned frogs. John Gurdon cloned South African frogs in 1962. His use of adult cells disproved the previous theory that only young cells could be used in the cloning process with success.

While animal cloning had been the focus of cloning experiments, the 1960s also saw other types of cloning. In 1964, F. C. Steward took an adult root cell from a carrot plant and successfully cloned the plant. Throughout the rest of the 1960s, scientists continued to clone frogs and to discover more about DNA. The first gene was discovered in 1969.

In 1977, the first cloned mice embryos were created. The first mammal was cloned in 1984. The cloned sheep was quickly followed in 1985 with cloned cattle embryos. A cow clone was created in 1986 and several calves in 1993. That same year, human embryos were cloned for the first time. In 1995 and 1996, sheep were cloned, including the famous Dolly.

【1】The first paragraph serves as a(n) __________________________.

A. explanation B. conclusion

C. comment D. background

【2】When as the first plant successfully cloned?

A. In 1952 B. In 1960

C. In 1964 D. In1969

【3】How is the passage organized?

A. In order of frequency

B. In order of time

C. In order of importance

D. In order of preference

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