题目内容
In recent years a new farming revolution has begun, one that involves the (21) of life at a fundamental level — the gene. The study of genetics has (22) a new industry called biotechnology. As the name suggests, it (23) biology and modem technology through such techniques as genetic engineering. Some of the new biotech companies specialize (24) agriculture and are working feverishly to duplicate seeds that give a high yield, that (25) diseases, drought and frost, and that reduce the need for (26) chemicals. (27) such goals could be achieved, it would be most beneficial. But some have raised concerns about genetically engineered crops. In nature, genetic diversity is created within certain space. A rose (28) be crossed with a different kind of rose, but a rose will never cross with a potato. Genetic engineering, (29) , usually involves taking genes from one species and inserting them into (30) in an attempt to transfer a desired characteristic. This could mean, (31) , selecting a gene which leads to the production of a chemical with anti-freeze quality from an arc- tic fish, and inserting (32) into a potato or strawberry to make it frost-resistant. In essence, then, biotechnology allows humans to (33) the genetic walls that separate species. Like the green revolution, (34) some call the gene revolution contributes to the problem of genetic uniformity — some say even more so that geneticists can employ techniques (35) as cloning and (36) culture, processes that produce perfectly (37) copies. Concerns about the erosion of biodiversity, therefore, (38) . Genetically altered plants, however, raise new issues, such as the effects that they may have (39) us and the environment. "We are flying blindly into a new era of agricultural biotechnology with high hopes, few constraints, and (40) idea of the potential outcomes," said science writer Jeremy Rifkin.
查看答案
搜索结果不匹配？点我反馈
更多问题
Passage 1 Man’s puzzlement and preoccupation with time both derive ultimately from his unique relationship to it. All animals exist in time and are changed by it; only man can control it. Like Proust, the French author whose experiences became his literary capital, man can recapture the past. He can also summon up things to come, displaying imagination and foresight alone with memory. It really can be argued, that memory and foresightedness are the essence of intelligence: that man’s ability to manipulate time, to employ both past and future as guides to present action, is what makes him human. To be sure, many animals can react to time after a fashion A rat can learn to press a lever that will, after a delay of some 25 seconds, reward it with a bit of food. But if the delay stretches beyond 30 seconds, the animal is stumped. It can no longer associate the reward so "far" in the future with the present lever-pressing. Monkeys, more smart than rats, are better able to deal with time. If one of them is allowed to see food being hidden under one of two cups, it can pick out the right cup even after 90 seconds have passed. But after that time interval, the monkey’s hunt for the food is no Better than chance predicts. With the apes, man’s nearest cousins, "time sense" takes a big step forward. Even under laboratory conditions, quite different from those they encounter in the wild, apes somemnes show remarkable ability to manipulate the present to obtain a future goal. A chimpanzee, for example, can learn to stack two boxes, one on the other, as a platform from which it can reach a hanging banana. Chimpanzees, indeed, carry their ability to deal with the future to the threshold of human capacity: they can make tools. And it is by the making of tools— physical tools as crude as a stone chopper, mental tools as subtle as a mathematical equation—that man characteristically prepares for future contingencies. Chimpanzees in the wild have been seen to strip a twig of its leaves to make a probe for extracting termites from their hole. Significantly, however, the ape does not make his tool before setting out on a termite hunt, but only when it actually sees the insects or their nest. Here, as with the banana and the crates, the ape can cope only with a future that is immediate and visible — and thus halfway into the present The word "contingencies" in the fifth paragraph means ______.
Part ADirections: For Questions 1～5, you will hear a dialogue on enrolling for a course. While you listen, fill out the table with the information you have heard; Some of the information has been given to you in the table. Write only I word in each numbered box. You will hear the recording twice. You now have 25 seconds to read the table below. The maximum number for the class is ______.
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。 How are you feeling now Shall I send ______ the doctor
Passage 3 On Tuesday August 11th, 1911, a young artist, Louis Beraud, arrived at the Louvre in Paris to complete a painting of the Salon Carre. This was the room where the world’s most famous painting, the Mona Lisa by Leonardo da Vinci, was on display. To his surprise there was an empty space where the painting should have been. At 11 o’clock the museurn authorities realized that the painting had been stolen. The next day headlines all over the world announced the theft. Actually the Leonardo had been gone for more than twenty-four hours before anyone noticed it was missing. The museum was always closed on Mondays for maintenance. Just before closing time on Sunday three men had entered the museum, where they had hidden themselves in a storeroom. The actual theft was quick and simple. Early the next morning Perrugia removed the painting from the wall while the others kept watch. Then they went out a hack exit. Nothing was seen or heard of the painting for two years when Perrugia tried to sell it to a dealer for half a million lire. Perrugia was arrested on December 13th Perrugia claimed he had stolen it as an act of patriot-ism, because, he said, the painting had been looted from the Italian nation by Napoleon. Perrugia was imprisoned for 7 months. It seemed that the crime of the century had been solved. But had it Perrugia was keen to claim all responsibility for the theft, and it was twenty years before the whole story came out. In fact Perrugia bad been working for two master criminals, Valfierno and Chaudron, who went unpunished for their crime. They would offer to steal a famous painting from a gallery for a crooked dealer or an unscrupulous private collector. They would then make a copy of the picture and, with the help of bribed gallery attendants, tape the copy to the back of the original painting. The dealer would then be taken to the gallery and would be invited to make a secret mark on the back of the painting. Of course the dealer would actually be marking the copy. Valfierno would later produce forged newspaper cuttings announcing the theft of the original, and then produce the copy, complete with secret marking. If the dealer were to see the painting still in the gallery, he would be persuaded that it was a copy, and that he possessed the genuine one. Chaudron then painted not one, but six copies of the Mona Lisa, using 400-year-old wood panels from antique Italian furniture The forgeries were carefully aged, so that the varnish was cracked and dirty. Valfierno commissioned Perrugia to steal the original, and told him to hide it until Valfierno contacted him Perrugia waited in vain in a tiny room in Paris with the painting, but heard nothing from his partners in crime. They had gone to New York, where the six copies were already in store. They had sent them there before the original was stolen. At that time it was quite common for artists to copy old masters, which would be sold quite honestly as imitations, so there had been no problems with US Customs. Valfierno went on to sell all six copies for $ 300 000 each. Valfierno told the story to a journalist in 1914, on condition that it would not be published until his death. Does the story end there Collectors have claimed that Perrugia returned a copy. It is also possible that Leonardo may have painted several versions of the Mona Lisa, or they might be copies made by Leonardo’s pupils. There has been a lot of controversy and argument about the 450-year-old painting, but after all, maybe that’s what She’s smiling about. Which of the following statements is TRUE according to the passage
微信支付 
支付宝支付