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.

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