听力原文:(With) Other viruses, such as smallpox and measles, and polioneuromere, the majority of people mount an immune response even if they never been vaccinated that clears the natural infection. With H1V, there are virtually no incidents of a person who has completely cleared the virus from their body, which means that although some people can control the virus better than others, the body is having trouble making a protective immune response.
What is the point the speaker is trying to make about HIV virus?
A. HIV vaccines trigger an immune response, but that response has proven inadequate.
B. The body's natural immune response to HIV infection could eradicate the virus.
C. The majority of people could mount an immune response even without being vaccinated that clears the natural infection from every virus.
D. Some people can control HIV virus better than others and make a protective immune response.
English didn’t become the official language of the England until ______ after the Hundred
A. 12th
B. 13th
C. 14th
D. 15th
Proponents of green architecture argue that the approach has many benefits. In the case of a large office, for example, the combination of green design techniques and clever technology can not only reduce energy consumption and environmental impact, but also reduce running costs, create a more pleasant working environment, improve employee's health and productivity, reduce legal liability and boost property values and rental returns.
Green architecture, a term which only came into use in the 1990s, has its origin in the energy crisis of the 1970s, when architects began to question the wisdom of building enclosed glass-and-steel boxes that required massive heating and cooling systems. Early proponents of more energy-efficient architecture included William McDonough, Bruce Fowle and Robert Fox in America, Thomas Herzog in Germany, and Norman Forster and Richard Rogers in Britain.
Which of the following statements is tree of the new building?
A. It is actually a cucumber-shaped building located in Britain.
B. It is a cucumber-shaped building located in Switzerland.
C. It is actually a pine-cone-shaped building located in Britain.
D. It is a pine-cone-shaped building located in Switzerland.
"Not so," say scientists John Barley and Bib Fatane. These men went beyond the headlines to probe the reasons why people didn't act. They found that a person has to go through two steps before he can help. First he has to notice that is an emergency.
Suppose you see a middle-aged man fall to the side waik. Is he having a heart attack? Is he in a coma (昏迷) from diabetes(糖尿病)? Or is he about to sleep off a drunk?
Is the smoke coming into the room from a leak in the air conditioning? Is it "steam pipes"? Or is it really smoke from a fire? It's not always easy to tell if you are faced with a real emergency.
Second, and more important, the person faced with an emergency must feel personally responsible. He must feel that he must help, or the person won't get the help he needs.
The researchers found that a lot depends on how many people are around. They had college students in to be "tested". Some came alone. Some came with one or two others. And some came in large groups. The receptionist started them off on the "tests". Then she went into the next room. A curtain divided the "testing room" and the room into which she went. Soon the students heard a scream, the noise of file cabinets falling and a cry for help. All of this had been pre-recorded on a tape-recorder.
Eight out of ten of the students taking the test alone acted to help. Of the students in pairs, only two out of ten helped. Of the students in groups, none helped.
In other words, in a group, Americans often fail to act. They feel that others will act. They, themselves, needn't. They do not feel any direct responsibility.
Are people bothered by situations where people are in trouble? Yes. scientists found that the people were emotional, they sweated, they had trembling hands. They felt the other person's trouble. But they did not act. They were m a group. Their actions were shaped by the actions of those they were with.
The purpose of this passage is______.
A. to explain why people fail to act in emergencies
B. to explain when people will act in emergencies
C. to explain what people will do in emergencies
D. to explain how people feel in emergencies