【正文】 s help find trapped people. Dogs’ amazing noses can pick up the smell of survivors. Now scientists have developed an electronic tool that does the same thing. It’s taking smell detection(探測) to a whole new level.The new invention is a sort of electronic nose, which can detect extremely low levels of many pounds(化合物) from people’s skin. This isn’t the first time engineers have developed such an object. Earlier models, however, have been bulky and expensive. They could not detect low levels of target pounds either. The new one is inexpensive and small enough to fit inside handheld equipment.The electronic nose can detect extremely slight smell of more than one pound at the same time. Being able to do this, in such a small object, is the significant discovery, says Sotiris E. Pratsinis, Professor of Process Engineeringamp。Materials Science at the Swiss Federal Institute of Technology in Zurich. His team tested it in special spaces. They were like the small spaces where people might be trapped. Chemicals given off by the volunteers built up inside. The electronic equipment detected those pounds at unbelievably low levels.The results were good news for the research team. But they may be not for our fourlegged friends, who could soon be out of a job. Ideally, this technology could replace search and rescue dogs, Pratsinis says.Stephen Taylor, an electrical engineer, agrees that the new technology has some benefits over dogs. Still, he thinks it may be too soon to have our trusty friends retire. He suspects, I foresee that such an object could add to the fine work done by the dogs. Taylor also pointed out some potential limitations of the new invention. Enoses are useful, but can be very likely to be affected by unstable readings and interruption, he says.8. Why does the author talk about dogs at the beginning?A. To catch the readers’ attention. B. To introduce the topic about enoses.C. To show what search and rescue dogs do. D. To add background information for discussion. 9. Which of the following best explains bulky underlined in paragraph 2? A. Complex B. Fragile C. Handy D. Large 10. What is Paragraph 3 mainly about? A. What enoses’ working principle is. B. How enoses are made. C. What differences between dogs and enoses are. D. How powerful enoses are.11. What does Stephen Taylor mean? A. Dogs and enoses could work together. B. Search and rescue dogs will retire soon. C. Enoses are more reliable than noses of dogs. D. Dogs are better at finding out trapped people.DTo be sure, only children experienced some things differently from those with sisters and brothers. Many feel more pressure to succeed. They also tend to look only to their parents as role models in the absence of brothers and sisters.In India, 10yearold Saviraj Sankpal founded a support group for the tiny minority(少數(shù)) of only children. Among other things, the group does volunteer work to fight against the false idea that they are not responsible. People think we’re treated too kindly and ruined, says Sankpal, a puter engineering student. But I39。d like to remind them how lonely it can get.Most only children, however, say they wish for sisters or brothers only when it es to caring for aging, unhealthy parents. Britain39。s David Emerson, coauthor of the book The Only Child, says that such a person has to make all the decisions alone. Emerson knows from experience. After his father died, he chose to move his elderly mother from the