题目

（09南充市适考）下列说法中，正确的是    A.胰高血糖素分泌增多后，胰岛素分泌就减少，进而降低对胰岛A细胞的抑制    B.将正常基因导入病人生殖细胞的细胞核中，可阻止遗传病遗传给子代    C.吞噬细胞摄取HIV病毒与抗体反应形成的沉淀并将其彻底水解，可产生4种核糖核苷酸D.用纯化的SARS病毒衣壳反复注射到小鼠体内，产生的血清抗体为单克隆抗体 If cars could drive themselves, what would the world be like? Imagine（设想）seeing an empty car passing by on its way to pick up its owner, or a car full of passengers who are reading, listening to music or even sleeping. But none of them are worried about the road ahead.Well, all of this could be the future of driving. There are several companies, including Google, working on driverless（无人驾驶的）cars. So far, no Google self-driven car has gotten a traffic ticket, but some of them have been in accidents when other cars hit them. These cars are now still in the testing stages（阶段）.But, if the tests are successful, these electric self-driven cars could be put into use very soon.The cars already have many features（特点）allowing them to take over from drivers during certain situations. Some features include cars being able to park（停车）themselves, or slow down when they notice objects close by. They can also control the speed if there are dangerous conditions.Scientists and engineers believe, with the help of wireless signals（无线信号）, cameras and GPS, we are now at a stage where creating a safe self-driven car might be possible.The cause of deadly road accidents is usually careless drivers or dangerous conditions. The self-driven car may be able to prevent（阻止）these. However, some people do not like the idea. American lawyer Whit Drake, for example, doesn't believe these cars are safe. He thinks that technologies（技术）can also be mistakes.1.The main purpose of the first paragraph is to __________.A.tell readers what self-driven cars look like B.tell readers to keep away from heavy trafficC.get readers to pay attention to road safety D.make readers wonder about self-driven cars2.What does the underlined word "take over from" in Paragraph3 mean? __________.A.direct the way for B.take the place ofC.work better than D.make use of3.Cars already have the following features EXCEPT __________.A.parking itself B.controlling itself in dangerous situationsC.slowing itself down near an object D.avoiding car accidents 100%4.What might make the self-driven cars run safely according to the passage?a. e-reading b. wireless signals c. cameras d. GPSA.a, b, c B.a, b, d C.b, c, d D.a, c, d5.What is the passage mainly about? __________.A.Advantages of self-driven cars B.Different opinions on self-driven carsC.Possibilities of self-driven cars D.Google's new technology-self-driven cars