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
It is indicated in the passage that competition between schools results in ________.
A．higher enrollment rate
B．lower academic standard
C．higher marketing expenses
D．privatization of further education
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