Each of six automated tasks, numbered 1 through 6, takes one full hour to　complete. No time elapses between the completion of any of the six tasks and　the beginning of another task. The group of six tasks must be completed in the　shortest possible time period, subject only to the following restrictions:　

　　Tasks 1 and 2 must both be completed before any of the other tasks can be begun.

　　Task 3 must be completed before task 4 can be begun.

　　At any one time, no more than one task can be performed, except that tasks 4　and 5 can be performed concurrently.

　　Which of the following tasks could be the second task performed¡

　　2

　　3

　　4

　　5

　　6

　　答案：(A)

　　The shortest possible time period in which the group of six tasks can be　completed is

　　two hours

　　three hours

　　four hours

　　five hours

　　six hours

　　答案：(D)

　　Which of the following CANNOT be true of any acceptable ordering of tasks¡

　　Task 1 is performed before task 2.

　　Task 3 is performed before task 6.

　　Task 4 is performed before task 6.

　　Task 5 is performed before task 3.

　　Task 6 is performed before task 3.

　　答案：(D)

　　If task 6 is performed as early in the order of tasks as is permissible, then　task 6 is performed

　　first

　　second

　　third

　　fourth

　　fifth

　　答案：(C)

　　Most television viewers estimate how frequently a particular type of accident　or crime occurs by how extensively it is discussed on television news shows.Television news shows report more on stories that include dramatic pictures such　as fires and motor vehicle accidents than they do on more common stories that　have little visual drama such as bookkeeping fraud.　

　　If the statements above are true, it can be properly concluded that which of　the following is also true¡

　　The time that television news reporters spend researching news stories is　　directly related to the number of viewers who will be affected by events like　　those in the news stories.

　　It is easier for crimes such as bookkeeping fraud to go unprosecuted than it　is for crimes such as arson.

　　The number of fires and motor vehicle accidents greatly increases after each　television news show that includes dramatic pictures of a fire or motor vehicle　accident.

　　Viewers of television news shows tend to overestimate the number of fires　and motor vehicle accidents that occur relative to the number of crimes of　bookkeeping fraud.

　　The usual selection of news stories for television news shows is determined　by the number of news reporters available for assignment.

　　答案：(D)

　　问题：如果上面的陈述正确，则能够推断出下面哪一个一定正确？

　　读题：许多电视观众通过一种特定事故或犯罪在电视新闻上被讨论的广阔性来估计其发生的频率。电视新闻报道包含象开枪射击或汽车事故等生动场面的事情比包含象偷书等不带有视觉效果的事情要多。

　　C. 当包含象开枪射击或汽车事故等场面的新闻被报道之后，开枪或汽车事故的数目将大大增加。（原文中说的是，观众根据事故被讨论的广阔性来估计其发生的频率。但是是不是实际上也是这样发生的，你是不知道的,所以C不对）

　　According to one psychological theory, in order to be happy, one must have an　intimate relationship with another person. Yet the worlds greatest composers　spent most of their time in solitude and had no intimate relationships. So the　psychological theory must be wrong.　

　　The conclusion above assumes that