单选题Man: Since you don't like your boss, why are you still hanging around him? Woman: I'm not. I'm going to stop hanging around and quit. Question: What does the woman mean?

单选题Sometimes we buy a magazine with absolutely no purpose ______ to pass time.

单选题The mayor has spent ahandsome amount of time in his last tern working to bring down the tax rate .

单选题If you continue to indulge in computer games like this, your future will be {{U}}at stake{{/U}}.

单选题The {{U}}conquest{{/U}} has been the subject of much conjecture.

单选题"This light is too ______ for me to read by. Don't we have a brighter bulb?" said the elderly man.

单选题Last year, physicist Professor Richard Muller and colleagues published results from a new project analyzing the Earth"s temperature record. The Berkeley Earth Surface Temperature (BEST) project basically backed up established temperature records from Nasa and others; the world is indeed warming, and by about as much as we previously thought, it concluded. Professor Muller was attacked in some quarters for not waiting for the formal process of peer review in a scientific journal before launching the data publicly. He responded that his method—to put the draft out there openly and let everyone respond who wants to—is increasingly the norm in physics. In his view, it"s the right way to do things. A couple of weeks ago, in a New York Times article accompanying the release of five more BEST papers that are being submitted to scientific journals, Professor Muller went further, saying that the majority of 20th Century warming could be laid at the door of greenhouse gas emissions. By contrast, analysis by established bodies such as the Intergovernmental Panel on Climate Change (IPCC) holds that only after mid-Century did greenhouse gases drive the warming—prior to that, it was predominantly down to natural causes such as solar cycles and a decline in the frequency of large volcanoes.

单选题The last mayor was assassinated when he was fifty years old.

单选题Annie's job as an assistant at the university observatory was to classify stars according to their spectr

单选题A: I'm anxious to get started on my project. Can we discuss it sometime before the weekend?B: ______

单选题A: A young man from AT&T would like to talk with the manager on the new project. Is she available? B: ______.

单选题Ted: I ate four hamburgers, Morn. Mother: Well, you've made a pig of yourself. Question: What do we learn from the conversation?

单选题The river burst its banks, ______ an entire village.

单选题A: I have an appointment to see Dr. Gram for a physical examination. B: ______.

单选题Difference in position adopted by oxygen and hydrogen atoms account for variations in the crystalline structure of different forms of ice.

单选题Tom is reliable, so you can {{U}}count on{{/U}} him.

单选题Many students today display a {{U}}disturbing{{/U}} willingness to choose institutions and careers on the basis of earning potential.

单选题The unpopular measure finally ______ the downfall of the government.

单选题Woman: Grey says he's going to take three extra classes.Man: He's got to be kidding.Question: What does the man mean?

单选题{{B}}Passage Five{{/B}} In 1999 when MiShel and Carl Meissner decided to have children, they tackled the next big issue: Should they try to have a girl? It was no small matter. MiShel's brother had become blind from a hereditary condition in his early 20s, and the Meissners had learned that the condition is a disorder passed from mothers to sons. If they had a boy, he would have a 50 per cent chance of having the condition. A girl would be unaffected. The British couple's inquiries about sex selection led them to Virginia, US, where a new sperm-separation technique, called MicroSort, was experimental at the time. When MiShel became pregnant she gave birth to a daughter. Now they will try to have a second daughter using the same technique. The technique separates sperm into two groups—those that carry the X-chromosome (染色体) producing a female baby and those that carry the Y-chromosome producing a male baby. The technology was developed in 1990s, but the opening of a laboratory in January 2003 in California marked the company's first expansion. "We believe the number of people who want this technology is greater than those who have access to it," said Keith L. Blauer, the company's clinical director. This is not only a seemingly effective way to select a child's gender. It also brings a host of ethical (伦理的) and practical considerations—especially for the majority of families who use the technique for nonmedical reasons. The clinic offers sex selection for two purposes: to help couples avoid passing on a sex-linked genetic disease and to allow those who already have a child to "balance" their family by having a baby of the opposite sex. Blauer said the company has had an impressive success rate: 91 per cent of the women who become pregnant after sorting for a girl are successful, while 76 per cent who sort for a boy and get pregnant are successful. The technique separates sperm based on the fact that the X chromosome is larger than the Y chromosome. A machine is used to distinguish the size differences and sort the sperm accordingly.