题目内容
13． a reply，he decided to write again.
A．Not receiving B．Receiving not
C．Not having received D．Having not received
C
解析:
此题考查的是现在分词在句子中作状语。这句话的意思是“没有收到答复，他决定再次写信”。“没有收到答复”发生在“他决定再次写信”之前，因此用having received。分词的否定应该在分词之前加上not。
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Dr. Jack M. Gwaltney, Jr. a professor at the University Of Virginia School Of Medicine infected six student volunteers with virus, the most common cause of colds. A few days later, when they were coughing and sneezing, he gathered 37 more people and divided them into three groups. Group 1 members spent three days and nights in the same room with one of the infected students, separated by a screen so they couldn't touch one another. Group 2 sat around a table while an infected volunteer talked, coughed and sang to them. Group 3 held hands with an infected student for ten seconds, and then touched their own noses or eyes.
Although most scientists at the time, the mid-70s, believed colds were spread by virus-laden droplets spread through the air when infected people coughed or sneezed, Gwaltney suspected physical contact might play an important role. Sure enough, of the 15 people who had touched a student volunteer, 11 became infected—compared with only one of those who had been sitting at the table, and none who had spent three days and nights together.
"The best evidence we have is that hand-to-hand contact is the most efficient way of transmitting virus," says Gwaltney. The study was one of a series that helped establish Gwaltney's reputation as a leading authority. Dr. Robert Couch says, "It would not be inappropriate to call him Mr. Common Cold."
When Gwaltney is asked how close scientists are to finding a cure, he replies: "If you mean ‘get rid of’, I don't think we're going to be able to do that with cold viruses any time soon. But if you look in the dictionary, you'll see that 'cure' is explained as a successful treatment. And we're not just getting more effective at treating the symptoms (症状)—we're getting at the root cause too. "
【小题1】Dr. Jack M. Gwaltney conducted the experiment in order to__________.
| A．find out the most common cause of colds |
| B．infect the student volunteer |
| C．find out the role physical contact plays in the common colds |
| D．find out the role virus-laden air plays in the infection of colds |
| A．sneezing at the infected person |
| B．touching the infected person |
| C．sitting together with the infected person |
| D．talking with the infected person |
| A．Dr. Gwaltney was sure that hand-to-hand touch is the cause of the common cold. |
| B．Only one of the people who had spent three days and nights together became infected. |
| C．Dr. Gwaltney conducted many an experiment as to the cause of colds. |
| D．Dr. Gwaltney tested altogether 43 volunteers to see how they could develop colds. |
| A．a newly-found virus |
| B．a nickname (绰号) of respect to Dr. Gwaltney |
| C．a method to cure colds |
| D．a way by which the other scientists laughed at Dr. Gwaltney |
| A．they have found the fundamental cause of colds |
| B．they have managed to wipe out the cold viruses |
| C．they have meant to experiment more |
| D．they have made much progress in dealing with colds |
Teens don’t understand the big fuss(小题大做).As the first generation to grow up in a wired world,they hardly know a time when computers weren’t around,and they eagerly catch the chance to spend hours online,chatting with friends.So what?
But researchers nationwide are increasingly worried that teens are becoming isolated(孤寂),less skillful at person-to-person relationships,and perhaps numb(麻木) to the cheatings that are so much a part of the e-mail world.“And a teen’s sense of self and values may be changed in a world where personal connections can be limitless,”said Sherry Turkle.
Another researcher,Robert Kraut,said he’s worried about the “opportunity costs”(机会成本) of so much online time for youths.He found that teens who used computers,even just a few hours a week,showed increased signs of loneliness and social isolation.“Chatting online may be better than watching television,but it’s worse than hanging out(闲逛) with real friends,”he said.
Today’s teens,however,don’t see anything strange in the fact that the computer takes up a central place in their social lives.“School is busy and full of pressure.There’s almost no time to just hang out,”said Parker Rice,17.“Talking online is just catch-up time.”
Teens say they feel good about what they say online or taking the time to think about a reply.Some teens admit that asking someone for a date,or breaking up,can be easier in message form,though they don’t want to do so.But they insist there’s no harm.
【小题1】The researchers argue that______.
| A．teens may develop a different sense of values |
| B．nothing is wrong with teens’ chatting online |
| C．teens can manage their social connections |
| D．spending hours online does much good to teens |
| A．use computers properly |
| B．improve their school work |
| C．develop an interest in social skills |
| D．reduce their mental pressures |
| A．teens’ pleasant online experience |
| B．teens’ computer skills and school work |
| C．the effects of the computer world on teens |
| D．different opinions on teens’ chatting online |
| A．describe computer research results |
| B．draw attention to teens’ computer habits |
| C．suggest ways to deal with problem teens |
| D．discuss problems teens have at school |