单选题From the incident they have learned a lesson: ______ decisions often lead to bitter regrets.

单选题I don't think it's sensible of you to ______ your greater knowledge in front of the chairwoman, for it may well offend her. A. show up B. show off C. show out D. show away

单选题Man: Hi, Susan. Have you finished reading the book Prof. Johnson recommended? Woman: Oh, I haven't read it through the way I'd read a novel. I just read a few chapters which interested me. Question: What does the woman mean? A. She seldom reads books from cover to cover. B. She is interested in reading novels. C. She read only part of the book. D. She was eager to know what the book was about.

单选题I wish that he hadn't had such a bad cold because I am sure that he ______ the performance,

单选题TV, if properly used, can ______ a child's imagination.

单选题{{B}}Passage Three{{/B}} Three years ago, researchers announced the discovery of human genes that were capable of turning ordinary cells into malignant ones. The news met with some skepticism. Experts asked how a single gene could cause such a dramatic change. Why does cancer take years or even decades to develop if it is caused by such a simple and direct process? In last week's issue of the, three research teams answered those questions by setting forth a new model for understanding the role of oncogenes in cancer. Each group found that it does in fact take more than a single gene to produce cancer in normal cells. Teams at M. I. T and Cold Spring Harbor Laboratory on Long Island, N. Y. , reported that they could induce cancer in normal rat cells only by inserting at least two types of oncogene into the cells. "A single oncogene produced some changes, but not cancer," explained molecular biologist Robert Weinberg of MIT. It took two genes acting cooperatively to produce a tumor. In other cases, it might take three or more. A British team confirmed the multistep cancer scenario by showing that a particular oncogene caused a tumor in hamster cells only if they had first been exposed to a carcinogenic chemical. The chemical alone and the oncogene alone did not cause cancer, both were necessary. While the discovery has no immediate implication for treatment of cancer, it helps explain why the disease develops slowly and why its incidence rises with age. "Even if one part of the process occurs," says Weinberg, "you might not have the second step for another 20 years. "

单选题______ quite recently, most mothers in Britain did not take paid work outside the home.

单选题Five minutes eaflier, and we the last bus.

单选题Jane takes an ______ interest in clothes and is very particular about what she wears. A. exhaustive B. excelling C. executive D. excessive

单选题Some psychologists maintain that mental acts such as thinking are not performed in the brain alone, but that one"s muscles also participate. It may be said that we think with our muscles in somewhat the same way that we listen to music with our bodies. You surely are not surprised to be told that you usually listen to music not only with your ears but with your whole body. Few people can listen to music that is more or less familiar with-out moving their body or, more specifically, some part of their body. Often when one listens to a symphonic concert on the radio, he is tempted to direct the orchestra even though he knows there is a competent conductor on the job. Strange as this behavior may be, there is a very good reason for it. One cannot derive all possible enjoyment from music unless he participates, so to speak, in its performance. The liste-ner "feels" himself into the music with more or less pronounced motions of his body. The muscles of the body actually participate in the mental process of thinking in the same way, but this participation is less obvious because it is less pronounced.

单选题As soon as the exams were over, the students all went their ______ ways. A. homely B. perspective C. respective D. diverted

单选题If connection between two sensors is blocked, the network will automatically ______.

单选题Some people argue that ______ regulations for water pollution will drive up costs and put jobs at risk.

单选题According to the passage, the students are complaining about their education, because ______.

单选题Speaker A. This pain in my head is terrible.Speaker B: ______

单选题A team of researchers in California has developed a way to predict what kinds of objects people are looking at by scanning what"s happening in their brains. When you look at something, your eyes send a signal about that object to your brain. Different regions of the brain process the information your eyes send. Cells in your brain called neurons are responsible for this processing. The FMRI (Functional Magnetic Resonance Imaging)brain scans could generally match electrical activity in the brain to the basic shape of a picture that someone was looking at. Like cells anywhere else in your body, active neurons use oxygen. Blood brings oxygen to the neurons, and the more active a neuron is, the more oxygen it will consume. The more active a region of the brain, the more active its neurons, and in turn, the more blood will travel to that region. And by using FMRI, scientists can visualize which parts of the brain receive more oxygen-rich blood—and therefore, which parts are working to process information. An FMRI machine is a device that scans the brain and measures changes in blood flow to the brain. The technology shows researchers how brain activity changes when a person thinks, looks at something, or carries out an activity like speaking or reading. By highlighting the areas of the brain at work when a person looks at different images, FMRI may help scientists determine specific patterns of brain activity associated with different kinds of images. The California researchers tested brain activity by having two volunteers view hundreds of pictures of everyday objects, like people, animals, and fruits. The scientists used an FMRI machine to record the volunteers" brain activity with each photograph they looked at. Different objects caused different regions of the volunteers" brains to light up on the scan, indicating activity. The scientists used this information to build a model to predict how the brain might respond to any image the eyes see. In a second test, the scientists asked the volunteers to look at 120 new pictures. Like before. their brains were scanned every time they looked at a new image. This time, the scientists used their model to match the FMRI scans to the image. For example, if a scan in the second test showed the same pattern of brain activity that was strongly related to pictures of apples in the first test, their model would have predicted the volunteers were looking at apples.

单选题This crime fiction was ______ very popular but nobody reads it today.

单选题Woman: I heard John and Frank had a quarrel.Man: Oh, they soon made up.Question: What does the man mean?

单选题The police are trying to find out the ______ of the woman killed in the traffic accident.

单选题Sally wanted to go to Florida for the holiday, but her husband thought{{U}} {{/U}},saying that they would go to New York to join his parents for Christmas.