【阅读RC】

The primary purpose of the passage is to

【逻辑CR】

Tiger beetles are such fast runners that they can capture virtually any nonflying insect.  However, when running toward an insect, the beetles intermittently stop, and then, a moment later, resume their attack.  Perhaps they cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running tiger beetles are unable to process the resulting rapidly changing visual information, and so quickly go blind and stop. Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two hypotheses and undermine the other?

【逻辑CR】

Pharmaceutical companies spend more than ever on research and development; yet the  number of new drugs patented each year has dropped since 1963. At the same time, profits— at constant 1963 dollars—for the industry as a whole have been steadily increasing. Which of the following, if true, is the single factor most likely to explain, at least in part, the  three trends mentioned above for money spent, drugs patented, and profits made?

【逻辑CR】

The contingency-fee system, which allows lawyers and their clients to agree that the lawyer will be paid only in the event of success, does not increase the number of medical malpractice lawsuits brought against doctors. As attorneys must cover the costs for their time and research,they want to be assured that any medical malpractice case they accept on a contingency-fee basis has substantial merit. Consequently, attorneys turn away many people who come to see them, for lack of a good case. The argument above is most vulnerable to criticism on the grounds that it fails to

【句子改错SC】

【OG20-P811-889题】While many of the dinosaur fossils found recently in northeast China seem to provide evidence of the kinship between dinosaurs and birds, the wealth of enigmatic fossils seem more likely at this stage that they will inflame debates over the origin of birds rather than settle them.

【数据充分DS】

【OG20-P276-272题】Lines k and m are parallel to each other. Is the slope of line k positive?(1) Line k passes through the point (3,2).(2) Line m passes through the point (−3,2).

【逻辑CR】

【OG20-P602-740题】Studies in restaurants show that the tips left by customers who pay their bill in cash tend to be larger when the bill is presented on a tray that bears a credit card logo. Consumer psychologists hypothesize that simply seeing a credit-card logo makes many credit card holders willing to spend more because it reminds them that their spending power exceeds the cash they have immediately available.Which of the following, if true, most strongly supports the psychologists' interpretation of the studies? 

【句子改错SC】

Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

【句子改错SC】

Surveys have shown that in up to 40 percent of elderly people living independently in affluent countries, the consumption of one or more essential nutrients is insufficient or they have deficient levels of these nutrients in their blood.

【逻辑CR】

It is true of both men and women that those who marry as young adults live longer than those who never marry. This does not show that marriage causes people to live longer, since, as compared with other people of the same age, young adults who are about to get married have fewer of the unhealthy habits that can cause a person to have a shorter life, most notably smoking and immoderate drinking of alcohol. Which of the following, if true, most strengthens the argument above?