单项选择题

The primary purpose of the passage is to

A．present the results of statistical analyses and propose further studies
B．explain a recent development and predict its eventual consequences
C．identify the reasons for a trend and recommend measures to address it
D．outline several theories about a phenomenon and advocate one of them
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单项选择题
Which of the following best describes the relation of the first paragraph to the passage as a whole
A．It makes a general observation to be exemplified.
B．It outlines a process to be analyzed.
C．It poses a question to be answered.
D．It advances an argument to be disputed.
单项选择题
The first sentence in the passage suggests that the observers mentioned in line 1 would be most likely to predict which of the following
A．that the number of new temporary positions would decline as fewer workers who preferred temporary employment entered the workforce
B．that the total number of temporary positions would increase as fewer workers were able to find permanent positions
C．that employers would have less control over the terms of workers' employment as workers in creased their bargaining strength
D．that the number of workers taking temporary positions would increase as more workers in any given demographic group entered the workforce
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