People who do regular volunteer work tend to live longer, on average, than people who do not. It has been found that “doing good,” a category that certainly includes volunteer work, releases endorphins, the brain’s natural opiates, which induce in people a feeling of well-being. Clearly, there is a connection: Regular releases of endorphins must in some way help to extend people’s lives.
Which of the following, if true, most seriously undermines the force of the evidence given as support for the hypothesis that endorphins promote longevity?
A. People who do regular volunteer work are only somewhat more likely than others to characterize the work they do for a living as “doing good.”
B. Although extremely high levels of endorphins could be harmful to health, such levels are never reached as a result of the natural release of endorphins.
C. There are many people who have done some volunteer work but who do not do such work regularly.
D. People tend not to become involved in regular volunteer work unless they are healthy and energetic to begin with.
E. Releases of endorphins are responsible for the sense of well-being experienced by many long-distance runners while running.
平均来说，有规律的义务工作的人往往活的更长。据发现，“做好事”包括义务工作，经常释放E 物质(内啡肽)，大脑的自然鸦片，使人感觉良好。显然，有这样一种关联：E 物质的规律释放在某种程度上肯定帮助延寿。
B 尽管E 的极高水平可能对健康有害，自然释放E 的结果绝不会到达这样的水平;无关，排除。
D 除非很健康，人们往往不会规律地义务工作;说明健康是义务工作的原因，削弱了义务工作导致健康，从而削弱了和义务工作相关联的E 物质导致了健康长
E. E 物质的释放导致很多长跑者跑步时有良好感觉;良好感觉，无关，排除。
Although the school would receive financial benefits if it had soft drink vending machines in the cafeteria, we should not allow them. Allowing soft drink machines there would not be in our students’ interest. If our students start drinking more soft drinks, they will be less healthy.
The argument depends on which of the following?
A. If the soft drink vending machines were placed in the cafeteria, students would consume more soft drinks as a result.
B. The amount of soft drinks that most students at the school currently drink is not detrimental to their health.
C. Students are apt to be healthier if they do not drink soft drinks at all than if they just drink small amounts occasionally.
D. Students will not simply bring soft drinks from home if the soft drink vending machines are not placed in the cafeteria.
E. The school’s primary concern should be to promote good health among its students.
E 学校的首要关注应该是提高学生健康;should 主观选项，且没提软饮机，排除。
A study of ticket sales at a summer theater festival found that people who bought tickets to individual plays had a no-show rate of less than 1 percent, while those who paid in advance for all ten plays being performed that summer had a no-show rate of nearly 30 percent. This may be at least in part because the greater the awareness customers retain about the cost of an item, the more likely they are to use it.
Which of the following would, if true, best serve as an alternative explanation of the results of the study?
A. The price per ticket was slightly cheaper for those who bought all ten tickets in advance.
B. Many people who attended the theater festival believed strongly that they should support it financially.
C. Those who attended all ten plays became eligible for a partial refund.
D. Usually, people who bought tickets to individual plays did so immediately prior to each performance that they attended.
E. People who arrived just before the performance began could not be assured of obtaining seats in a preferred location.