单项选择题

The example of dogs and cats in the second paragraph is intended to ______.

A．explain which animals are mammals
B．show the differences between mammals
C．illustrate how shallow dreamless sleep is
D．reveal how smart they are
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单项选择题
Real competition can happen only when ______.
A．academic standard is improved
B．there are comparable schools with different educational qualities
C．students have different interests
D．schools of all areas have sufficient budget for their development
单项选择题
What might be the author's attitude towards competitions between nearby schools
A．The author is in favor of various kinds of competition.
B．The author is indifferent to any competition and its result.
C．The author is not certain of the effect of competitions.
D．The author is against inter-collegiate competitions.
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