Dense snow cover can cause unusually harsh weather patterns to persist. If a severe winter storm blankets the Great Plains, the snow cover reflects the sun’s radiation back into space and thus keeps the temperature of the ground tow. Consequently, cold air moving down from Canada remains cold enough to cause more snowstorms. Which of the following is a conclusion that can be properly drawn from the information above
A. Winter weather on the Great Plains is the product of unusual movements of air masses.
B. The Great Plains are more likely than other areas to suffer unusually harsh weather patterns.
C. If the Great Plains get more snow than usual early in the winter and the snow remains until the spring thaw, the winter is likely to be colder than usual.
D. Even if the temperatures on the Great Plains are not extremely cold but are just below freezing, a moderate snowstorm will probably turn into a blizzard.
E. (E) The temperature of the ground depends primarily on the thickness of the snow cover.
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Book Review: When I read a novel set in a city I know well, I must see that the writer knows the city at least as well as I do if I am to take that writer seriously. If the writer is faking, I know immediately and do not trust that writer. When a novelist demonstrates the required knowledge, I trust the storyteller, so. I trust the tale. This trust increases my enjoyment of a good novel. Peter Lee’s second novel is set in San Francisco. In this novel, as in his first, Lee passes my test with flying colors. Which one of the following can be properly inferred from the passage
A. The book reviewer enjoys virtually any novel written by a novelist whom she trusts.
B. If the book reviewer trusts the novelist as a storyteller, the novel in question must be set in a city the book reviewer knows well.
C. Peter Lee’s first novel was set in San Francisco.
D. The book reviewer does not trust any novel set in a city that she does not know well.
E. (E) The book reviewer does not believe that she knows San Francisco better than Peter Lee does.
When released into the atmosphere, the refrigerant Freon damages the Earth’s ozone layer. A new kind of refrigerant does not have this effect. The manufacturer claims that replacing Freon with the new refrigerant in both new and existing refrigerators will prevent any further Freon damage to the ozone layer apart from that being done by the Freon already in the atmosphere. Which of the following must be true if the manufacturer’s prediction is to prove accurate
A. Freon can be replaced with the new refrigerant without releasing any Freon into the atmosphere.
B. The damage already done to the ozone layer is not of environmentally significant proportions.
C. The atmosphere can reverse the damage to the ozone layer caused by the past use of Freon.
D. The new refrigerant can counteract the damaging effects of Freon on the Earth’s atmosphere.
E. (E) The new refrigerant causes no environmental damage of any kind when it is released into the atmosphere.
无论什么样的计算机系统在调度作业的时候必须遵循—必要条件，即______。
Biometric access-control systems—those using fingerprints, voiceprints, etc., to regulate admittance to restricted areas—work by degrees of similarity, not by identity. After all, even the same finger will rarely leave exactly identical prints. Such systems can be adjusted to minimize refuels of access to legitimate access-seekers. Such adjustments, however, increase the likelihood of admitting impostors. Which of the following conclusions is most strongly supported by the information above
A. If a biometric access-control system were made to work by identity, it would not produce any correct admittance decisions.
B. If a biometric access-control system reliably prevents impostors from being admitted, it will sometimes turn away legitimate access-seekers.
C. Biometric access-control systems are appropriate only in situations in which admittance of impostors is less of a problem than is mistaken refusal of access.
D. Nonbiometric access-control systems—based, for example, on numerical codes—are less likely than biometric ones to admit impostors.
E. (E) Anyone choosing an access-control system should base the choice solely on the ratio of false refuels to false admittances.
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