GWD - CR - 大全 附解释(14)

GWD-TN-15 3. GWD21-Q3:

Highway Official: When resurfacing our concrete bridges, we should use electrically conductive concrete (ECC) rather than standard concrete. In the winter, ECC can be heated by passing an electric current through it, thereby preventing ice buildup. The cost of the electricity needed is substantially lower than the cost of the deicing salt we currently use. Taxpayer: But construction costs for ECC are much higher than for standard concrete, so your proposal is probably not justifiable on economic grounds.

Which of the following, if true, could best be used to support the highway official‘s proposal in the face of the taxpayer‘s objection?

A. The use of de-icing salt causes corrosion of the reinforcing steel in concrete bridge decks and damage to the

concrete itself, thereby considerably shortening the useful life of concrete bridges. B. Severe icing conditions can cause power outages and slow down the work of emergency crews trying to get power

restored. C. In weather conditions conducive to icing, ice generally forms on the concrete surfaces of bridges well before it

forms on parts of the roadway that go over solid ground. D. Aside from its potential use for de-icing bridges, ECC might also be an effective means of keeping other concrete

structures such as parking garages and airport runways ice free. E. If ECC were to be used for a bridge surface, the electric current would be turned on only at times at which ice was

likely to form. 原因：ECC建设费用比Sc高，

结论：所以这个建议不是建立在经济效用上

削弱：SC会缩短桥的寿命，相比建设费用，因此更加不经济。

4. GWD21-Q4: Which of the following most logically completes the passage?

Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost always have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two

misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since ______.

A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions

that are much less serious than appendicitis B. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in

fact, have it C. all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitis

D. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally

associated with appendicitis E. the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are

generally associated with appendicitis

文章的要求有两个：

1.largely avoid unnecessary removals of the appendix 2.without performing any fewer necessary ones than before

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B新方法2%的误诊是将实际未生病的人诊断为生病，换句话说就是实际生病的人一个都不会漏掉，符合without performing any fewer necessary ones than before的要求，同时由于未生病的人诊断为生病的比例只有2%，大大低于原来的20%，因此符合largely avoid unnecessary removals of the appendix C新方法诊断为有病的实际上都有病，这符合largely avoid unnecessary removals of the appendix ，但是新方法诊断为没病的是不是都没病呢，选项没有交代，因此无法判断是否符合without performing any fewer necessary ones than before（如果新方法诊断为没病的实际上有病，这样就会出现漏诊，会performing fewer necessary ones than before，不符合题目要求）

11. GWD7-Q37:（CD-5-37）

Escalating worldwide demand for corn has led to a sharp increase in the market price of corn, and corn prices are likely to remain high. Corn is extensive used as feed for livestock, and because profit margins are tight in the livestock business, many farmers are expected to leave the business. With fewer suppliers, meat prices will surely rise. Nonetheless, observers expect an immediate short-term decrease in meat prices.

Which of the following, if true, most helps to justify the observers‘ expectation?

A. The increase in corn prices is due more to a decline in the supply of corn than to a growth in demand for it. B. Generally, farmers who are squeezed out of the livestock business send their livestock to market much earlier than

they otherwise would. C. Some people who ate meat regularly in the past are converting to diets that include little or no meat. D. As meat prices rise, the number of livestock producers is likely to rise again.

E. Livestock producers who stay in the business will start using feed other than corn more extensively than they did in

the past.

1。D错的原因：producers增加不见得livestock的供给增加而导致价格减低

B对的原因：那些被挤出生意的农民，为结束生意，通常没等livestock长到一定程度就卖掉（因为他们状况一样，被挤出市场时间差不多），从而导致市场短期供应过多而价格短期下降。

lawyer

You think too much. We donnot know whether the price will decrease, let alone it happen at once or after a period of time.

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14: GWD-18-Q30

The ancient Nubians inhabited an area in which typhus occurs, yet surprisingly few of their skeletons show the usual

evidence of this disease. The skeletons do show deposits of tetracycline, an antibiotic produced by a bacterium common in Nubian soil. This bacterium can flourish on the dried grain used for making two staples of the Nubian diet, beer and bread. Thus, tetracycline in their food probably explains the low incidence of typhus among ancient Nubians. Which of …… 此处隐藏：6372字，全部文档内容请下载后查看。喜欢就下载吧 ……