When demand for a factory’s product is high, more money is spent at the factory for safety precautions and machinery than when demand is low. Thus, the average number of on-the-job accident per emplyee each month should be lower during periods when demand is high than when demand is low and less money is available for safety precautions and machinery maintenance.
Which of the following, if true about a factory when demand for its product is high, casts the most serious doubt on the conclusion drawn above ?
(A)Its employees ask for higher wages than they do at other times (B)Its management hires new workers but lacks the time to train them properly. (C)Its emplyees are less likely to lose their jobs than they are at other times (D)Its management sponsors a monthly safety award for each division in the factory (E)Its sold machinery is replaced with modern, automated models
A recent report determined that althought only 3 percent of drivers on Maryland highways equipped their vehicles with radar detectors, 33 percent of all vehicles ticketed for exceeding the speed limit were equipped with them. Clearly, drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit reguarly than are drivers who do not.
The conclusion above depends on which of the following assumptions ?
(A)Drivers who equip their vehicles with radar detectors are less likely to be ticketed for exceeding the speed limit than are drivers who do not (B)Drivers who are ticketed for exceeding the speed limit are more likely to exceed the speed limit regularly than are drivers who are not ticketed (C)The number of vehicles that were ticketed for exceeding the speed limit was greater than the number of vehicles that were equipped with radar detectors (D)Many of the vehicles that were ticketed for exceeding the speed limit were ticketed more than once in the time period covered by the report (E)Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report
In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand. Such burrowing discourages barnacles from clinging to their shells. When fully grown, however, the crabs can readily withstand tidal currents without burrowing, and thus they require substantial populations of barnacles. Surpringly, in areas where tidal currents are very weak, juvenile horseshoe crabs are found not to have significant barnacle populations, even though they seldom burrow.
Which of the following, if true, most helps to explain the surprising finding ?
(A)Tidal currents do not themselves dislodge barnacles from the shells of horseshoe crabs (B)Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest. (C)The strength of the tidal currents in a given location varies widely over the course of a day (D)A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food (E)Utill they are fully grown, horseshoe crabs shed their sheels and grow new ones several times a year 作者: tlmoonsand 时间: 2010-10-20 01:50
个人思路，LZ可以参考，共勉： 第一题，结论是说产品需求旺盛时安全投入多，因而生产事故发生少，反之需求萎靡钱投入少，生产事故多。问削弱条件。题中由投钱提高安全措施推出事故少，削弱即是事故多，B就是导致有投钱但依然可能有事故的 第二题，结论是装雷达更可能超速，问支持条件。题中说3%装了雷达，但被罚的相对比例却远远大于此，达到33%，注意超速和被罚不是相同的，要建立二者关系，则加上B就是说超速多更可能被罚（此题比较绕） 第三题，理论上没有burrow就有很多barnacle，但finding却相反，找原因。此题应该比较明显吧，E说换壳，换了之后就没有barnacle了，而且也不违背之前的研究理论（会有很多barnacle，只是换壳换掉了） 欢迎各位纠正，指教~作者: xiangmingliu08 时间: 2010-10-20 13:51
谢谢啦，貌似懂了！