Science is still largely ignorant ________ the causes of many kinds of cancer.

A . although B . despite C . though D . but

A . Increase seek translation B . Increase data transfer rate C . Decrease rotational latency D . Increase rotational latency

A. interesting B. the interesting C. more interesting D. most interesting

A.can’t have seen B.mustn’t have seen C.could not see D.must not see

A．there will be clearer difference among the sciences of various countries. B．there will be more scientists compete with each other. C．people will increasingly believe in science. D．more people will agree on its basic concepts.

A．mustn't have seen B．could not see C．can't have seen D．must not see

A．might not see B．could not see C．can't have seen D．mustn't have seen

W: Yes, we can convert your leftover RMB back into foreign money. Q: How much RMB yuan does the customer want to exchange for US dollars？ (19) A．700 yuan. B．600 yuan. C．650 yuan. D．750 yuan.

In the 1700s, height and weight became an important part of beauty. During the time of the French Revolution, many women used to wear corsets, belts that made their waists appear much slimmer. In England in the 1500s, makeup became an important part of beauty. Some women used to paint their .face white. They thought this made them more attractive. Later, in North America, some women used to eat arsenic, a dangerous poison, to make their faces whiter. By the 1860s, American women started using makeup to make themselves more charming. In the 1890s, Americans discovered that bicycle tiding could actually improve their appearance! They exercised in order to look and feel better. The popularity of bicycle riding even led to a change in fashion. American women began to wear shorter skirts instead of the. traditional long, full ones. Although diet and exercise are still popular ways of improving one's appearance, there are some parts of the body that cannot change without the help of a cosmetic surgeon. In the past, American women used to spend weeks repeating words that started with the "P" because they wanted to change the shape of their mouths. Today a cosmetic surgeon can reshape the nose or lips in a few hours. Rhinoplasty, the reshaping of nose, can greatly improve a person's image. Surprisingly, cosmetic surgery has been used for centuries in China and India. Today it is used in many countries to improve the outlook of people who have been hurt in fires or in car accidents It is also used to improve the appearance of children who are born with physical problem. Questions: 15.What is the topic of the lecture？ 16.What did women in North America do to improve their appearance in 1890s？ 17.What do you think is the speaker's attitude towards rhinoplasty？ 18.Which statement is NOT true according to the lecture？ (35) A．Why people will take plastic surgery. B．How cosmetics develop in its long history. C．How the change of fashion led to the development of cosmetic surgery. D．How people from all over the world make themselves look better.

Using placebos to test drugs sometimes has a surprising result. Researchers say people taking the placebo often report improvements in their health. This is known as "the placebo effect"--pain that is eased or stopped by an inactive substance. In such testing, the drug must perform. better than the placebo to prove that it is effective. Doctors have reported that the placebo effect can be used in treatment. For example, a doctor tells a patient that a new drug will stop the pain in his leg. The pill is only sugar. But the patient does not know that. He takes the pill and says his pain is gone. Scientists are beginning to discover some physical reasons for this reaction in some people. They are learning that much of what people believe to be true comes from what the brain expects is going to happen. If the brain believes a drug will ease pain, the brain may begin physical changes in the body that can cause the expected effect. A recent examination of studies on drugs for depression found that placebos eased the depression about as well as the active drugs. Other studies have explored the power of placebos. A study in Japan involved thirteen people who reacted to the poison ivy (常青藤)plant. Poison-ivy causes red itchy sores(伤痕)on some people who touch it. Each person was rubbed on one arm with a harmless leaf, but was told it was poison ivy. Each person was then touched on the other arm with poison ivy, but was told it was a harmless leaf. All thirteen people developed a reaction on the arm where the harmless leaf touched their skin. Only two reacted to the poison ivy leaves. Doctors and scientists worry that the use of placebos may not always be harmless. They say people can become victims of false doctors and others who use placebos to claim they can cure disease. What do medical researchers usually use to make placebo pills？ A．Ivy leaves. B．Harmless leaves. C．Medicine being tested. D．sugar.

(1). Betty is British now. A、 Right. B、Wrong. C、Doesn't say. (2). Betty has long beautiful hair. A、 Right. B、Wrong. C、Doesn't say. (3). Ray likes his job. A、 Right. B、Wrong. C、Doesn't say. (4). Both Betty and Ray like traveling. A、 Right. B、Wrong. C、Doesn't say. (5). Betty can play the piano well. A、 Right. B、Wrong. C、Doesn't say.

These crimes are not usually committed by people who are poor or in need. Young people often dislike and hate the adult world. They will do things to show that they are rebels. Also in Britain today it is easier for young people to commit crimes because they have more freedom to go where they like and more money to do what they like. There are two other possible causes which are worth mentioning. More and more people in Britain live in large towns. In a large town no one knows who anyone else is or where they live. But in the village I come from crimes are rare because everyone knows everyone else. Although it is difficult to explain, I think the last cause is very important. Perhaps there is something with our society which encourages violence and crime. It is a fact that all the time children are exposed to films and reports about crime and violence. Many people do not agree that this influences the young people, but I think that young people are very much influenced by the society they grow in. I feel that the fault may be as much with our whole society as with these young people. 6. From the passage we know that many British people are confused about (). A. the cause of juvenile crimes B. the rise of the crime rate C. the problem of crimes in their country D. the various kinds of juvenile delinquency 7. One reason why young people in large cities are more likely to commit crimes is that (). A. nobody knows anything about others B. they are free to move C. they live a better life D. they need more money 8. According to the passage, which groups of the following young people are LEAST likely to commit crimes？ A. Those living in big cities B. Those who are in need of help C. Those who are very poor D. Those living in the countryside 9. Unlike many others, the author holds that one important cause for juvenile delinquency is that(). A. young people nowadays do not like adult world B. young people in Britain today are freer than before C. too many young people have come to live in big cities D. young people are influenced by crime and violence in films and newspapers 10.According to the passage, which is to blame for juvenile crimes, apart from the young people themselves？ A. The adult world B. Their parents C. The development of the cities D. The society

A．How about B．Should you C．Couldn’t you

A．similar to B．referred to C．related to D．connected to

A、 Machine learning B、 Program language learning C、 Natural language learning D、 Statistical learning

A.Restrict access to pages that have broken links B.Design a custom 404 error message page with a hyperlink that sends users back to the site C.Set HTTP so it never redirects to error pages D.Design a Multipurpose Internet Mail Extensions (MIME) type to solve the problem