单项选择题

The main idea of the last paragraph is that ______.

A．paper record is the most convenient medium or later reference
B．electronic mail costs less than postage to mail paper memos
C．different media for information may be selected for different purposes
D．by using different media, a firm can create various information for its objectives

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单项选择题

What effect does joblessness and cuts in public assistance have on children of single-parent families

A．Another 3 million of them live in poverty.
B．The number of them increased by about 20 percent in just three years.
C．The number of them increased by about 3 percent in the 1980s.
D．They were not affected at all.

单项选择题

We can come to the conclusion that ______.

A．60 percent of American children are now born illegitimately
B．at least 50 percent of black children are now born illegitimately in America
C．60 percent of American children were born illegitimately in the 1960s
D．at least 60 percent of American children were born illegitimately in the 1960s