Q59.The average age of CEOs in a large sample of companies is 57. The average age of CEOs in those same companies 20 years ago was approximately 8 years younger. On the basis of those data, it can be concluded that CEOs in general tend to be older now Which of the following casts the mot doubt on the conclusion? A). The dates when the CEOs assumed their current positions have not been specified B). No information is given concerning the average number of years that CEOs remain in the office C). The information is based only on companies that have been operating for at least 20 years D). Only approximate information is given concerning the average age of the CEOs 20 years ago E). Information concerning the exact number of companies in the sample has not been given
正确答案是C,我选A, 因为觉得A中The dates才能说明比较的有效性- by comparing the exact ages CEOs start their current positions, the comparison makes sense, correct? 总觉得C没有A好,好心人可以帮忙解释一下这道题目吗..?
Q95. Most disposable plastic containers are now labeled with a code number (from 1 to 9) indicating the type or quality of the plastic. Plastics with the lowest code numbers are the easiest for recycling plants to recycle and are thus the most likely to be recycled after use rather than dumped in landfills. Plastics labeled with the highest numbers are only rarely recycled. Consumers can make a significant long-term reduction in the amount of waste that goes unrecycled, therefore, by refusing to purchase those products packaged in plastic containers labeled with the highest code numbers. Which one of the following, if true, most seriously undermines the conclusion above? A). The cost of collecting, sorting, and recycling discarded plastics is currently higher than the cost of manufacturing new plastics from virgin materials. B). Many consumers are unaware of the codes that are stamped on the plastic containers C). A plastic container almost always has a higher code number after it is recycled than it had before recycling because the recycling process cause a degradation of the quality of the plastic D). Products packaged in plastics with the lowest code numbers are often more expensive than those packaged in the higher-numbered plastics E). Communities that collect all discarded plastic containers for potential recycling later dump in landfills plastics with higher-numbered codes only when it is clear that nor recycler will take them
个人认为B最好,因为unaware的话,consumers就不会注意这些分类,那么plastics labeled with the highest numbers which are rarely recycled won’t have long-term reduction.. 正确答案C,不明白... |