单选题The rear section of the brain does not contract with age, and one can continue living without intellectual or emotional faculties.

单选题One of the real services of the historical novel is not that it can be a substitute for history, but that it can be a(n) extension.

单选题The elements other than hydrogen and helium exist in such small quantities that it is accurate to say that the universe is somewhat more than 75 percent hydrogen. Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found in old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth(cosmic "rays" are not really a form of radiation; they consist of rapidly moving particles of numerous different kinds). It doesn"t seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it; in others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same. Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to be significantly greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning. However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperatures were too high and particles of matter were moving around much too rapidly. It was only after the one-minute point that helium could exist. By this time, the universe had cooled sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formation of helium went on for only a relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased.

单选题"Pass Rose and Kate some bread."

单选题 When I interviewed Smith, he was always ______ and agreeable, though people who worked for him considered him a petty tyrant, demanding and intolerant.

单选题(I have been) told that he (will have come) if he (were) (able).A. have beenB. will have comeC. wereD. able

单选题She is leaving her husband because she cannot______his bad temper any longer.

单选题The Commission found instances where police officers had lied under oath, ______ evidence, neglected black prisoners and wrongly imprisoned Aborigines. A. entailed B. fabricated C. cleansed D. precluded

单选题Some economists maintain that______.

单选题We've ______ sugar. Ask Mrs. Jones to lend us some. A. run away with B. run out of C. run off D. run down

单选题Never in my life ______ such a thing. A. I have heard or have seen B. have I heard or seen C. I have heard or seen D. did I hear or see

单选题It was difficult for him to buy good shoes because he had such a big ______ of feet.

单选题By "Miuccia Prada was obviously biting her nails" (Paragraph 1), the author means ______.

单选题In that country the coins are so ______ that one has to carry great quantities to make a single purchase.

单选题The virus can affect the computers in the computer system by ______.

单选题This bridge is ______ that one.

单选题The prison guards were armed and ready to shoot if ______ in any way.

单选题We don't know what the surface of Venus might______.

单选题All the housewives who went to the new supermarket had one great ambition: to be the lucky customer who did not have to pay for her shopping. For this was what the notice just inside the entrance promised. It said : " Remember, once a week, one of our customers gets free goods. This May Be Your Lucky Day!" For several weeks Mrs. Edwards hoped, like many of her friends, to be the lucky customer. Unlike her friends, she never gave up hoping. The cupboards in kitchen were full of things which she did not need. Her husband tried to advise her against buying things but failed. She dreamed of the day when the manager of the supermarket would approach her and say," Madam, this is Your Lucky Day. Everything in your basket is free. " One Friday morning, after she had finished her shopping and had taken it to her car, she found that she had forgotten to buy any tea. She dashed back to the supermarket, got the tea and went towards the cash-desk. As she did so, she saw the manager of the supermarket approach her. " Madam," he said, holding out his hand, "I want to congratulate you! You are our lucky customer and everything you have in your basket is free!/

单选题Professor Kumar Bhatt, founder and head of Warwick Manufacturing Group (WMG), and Rob Meakin, a personnel director at Marconi, have developed a partnership to train engineers and managers to become e-literate. The New Knowledge Partnership will include a team of 40 Marconi managers in what Professor Bhatt calls electronic engineering management or E2. A wide range of engineering and non-engineering companies has expressed interest in these exciting programs. Professor Bhatt believes that e-commerce is changing the business environment to a huge extent. Many chief executives do not understand the power of the new technologies and, in some cases, are actually resisting change. He says, "as long as enough industry leaders realize its potential benefits, e-business will make possible a second productivity revolution in Britain. This could take the economy close to eliminating the still substantial competitiveness gap with its main rivals. Over the last five years in the US there has been a 30% improvement in manufacturing sector productivity because of information technology. In Britain we can achieve more than that and successful e-business will be worth billions to the UK economy." Already Britain makes more use of computer-aided design and manufacture (CAD/CAM) and management information technology systems than other European countries, and has a government that actively promotes e-business. But, observes Professor Bhatt, Britain has never used technology as a growth driver. "The thing about electronic engineering management is that you can keep your legacy systems; you just need to link those systems with an information engine. At the touch of a button it will allow project managers to see the status of a project, identify problems precisely and make virtually immediate decisions based on information that will be much more complete than in the past." The E2 program is the result of an alliance by the Warwick Manufacturing Group with America"s leading e-commerce study center, Carnegie Mellon. The latter will be responsible for training many of the Marconi managers in America, where the group has half its business. In Britain, Professor Bhatt has linked up with Sun Microsystems, Oracle and Parametric Technology, to set up a multi-million pound E2 design and manufacturing center at the university which will be used for training and research. Professor Bhatt believes that e-commerce is changing business to such an extent that WMG is likely to be renamed Warwick Electronic Manufacturing Group. But, he warns "The move to globalize because of e-commerce is racing ahead. Although the net allows British industry to overtake their European peers, it also offers Asian countries to leapfrog (跃过) the West. For the first time it is not the privilege of the western world because this technology is universal."