单选题In her bright red dress Kathy was very conspicuous.

单选题A: Have a nice weekend!B: ______

单选题Woman: Don't forget to drop me a line when you settle down. Man: I won't. I'll keep you posted. Question: What does the man mean?

单选题Tim is dubious about diet pills which advertise quick weigh loss.

单选题Can you compress your speech into five minutes due to limited time for the meeting?

单选题Moving parts of machines and motor vehicles have to be ______ regularly to reduce friction.

单选题It's evident that her handling of them has bruised the peaches.

单选题When television was first (introduced), the extent to (that) it would (affect) society could not (have been foreseen).A. introducedB. thatC. affectD. have been foreseen

单选题We should never underestimate influence we can have on the children we love.

单选题Industrialists and engineers are busy taking advantage of the mineral deposits ______, regardless of the fact that this ruthless exploitation is deleterious (有害的).

单选题Most people would agree that, although our age exceeds all previous ages in knowledge, there has been no corresponding increase in wisdom. But agreement ceases as soon as we attempt to define "wisdom" and consider means of promoting it. There are several factors that contribute to wisdom. Of these I should put first a sense of proportion: the capacity to take account of all the important factors in a problem and to attach to each its due weight. This has become more difficult than it used to be owing to the extent and complexity of the special knowledge required of various kinds of technicians. Suppose, for example, that you are engaged in research in scientific medicine. The work is difficult and is likely to absorb the whole of your mind. You have no time to consider the effect which your discoveries or inventions may have outside the field of medicine. You succeed (let us say) asmodern medicine has succeeded, in enormously lowering the infant death-rate, not only in Europe and America, but also in Asia and Africa. This has the entirely unintended result of making the food supply inadequate and lowing the standard of life in the parts of the world that have the greatest populations. To take an even more dramatic example, which is in everybody's mind at the present time, you study the makeup of the atom from a disinterested (无利害关系的) desire for knowledge, and by chance place in the hands of a powerful mad man the means of destroying the human race. Therefore, with every increase of knowledge and skill, wisdom becomes more necessary, for every such increase augments (增强) our capacity for realizing our purposes, and therefore augments our capacity for evil, if our purposes are unwise.

单选题Man: Is the freeway always this deserted? Woman: It's the middle of the day. Everyone is at work. Question: What does the woman imply?

单选题That night Peter Uswore/U to be free or die in the cause the freedom of slaves.

单选题A: The city council has finally voted the funds to build a new high school.B: It's about time they did it.______

单选题A: Did you buy the book? B:______

单选题Dating from around

单选题We no longer keep up the close friendship of few years ago, though we still visit each other {{U}}on occasion{{/U}}.

单选题We're ______ 50 new staff this year as business grows.

单选题We sometimes think humans are uniquely vulnerable to anxiety, but stress seems to affect the immune defenses of lower animals too. In one experiment, for example, behavioral immunologist (免疫学家) Mark Laudenslager, at the University of Denver, gave mild electric shocks to 24 rats. Half the animals could switch off the current by turning a wheel in their enclosure, while the other half could not. The rats in the two groups were paired so that each time one rat turned the wheel it protected both itself and its helpless Partner from the shock. Laudenslager found that the immune response was depressed below normal in the helpless rats but not in those that could turn off the electricity. What he has demonstrated, he believes, is that lack of control over an event, not the experience itself, is what wakens the immune system. Other researchers agree. Jay Weiss, a psychologist at Duke University School of Medicine, has shown that animals who are allowed to control unpleasant stimuli don't develop sleep disturbances or changes in brain chemistry typical of stressed rats. But if the animals are conditioned to confront with situations they have no control over, they later behave passively even when faced with experiences they can control. Such findings reinforce psychologists' suspicions that the experience or perception of helplessness, is one of the most harmful factors in depression. One of the most startling examples of how the mind can alter the immune response was discovered by chance. In 1975 psychologist Robert Ader at the University of Rochester School of Medicine conditioned (便形成条件反射) mice to avoid saccharin (糖精) by simultaneously feeding them the sweetener and injecting them with a drug that while suppressing their immune systems caused stomach upsets. Associating the saccharin with the stomach pains, the mice quickly learned to avoid the sweetener. In order to extinguish this dislike for the sweetener, Ader reexposed the animals to saccharin, this time without the drug, and was astonished to find that those mice that had received the highest amounts of sweetener during their earlier conditioning died. He could only speculate that he had so successfully conditioned the rats that saccharin alone now served to weaken their immune systems enough to kill them.

单选题Wireless sensor networks promise to ______.