单项选择题

The digestive enzyme pepsin breaks down proteins into components______ readily absorbed by the human body.

A．that can be
B．and are
C．which they
D．are to be
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单项选择题
Children going to school must have a chance to______ excess physical energy; children even more than adults require and enjoy physical exercise and games of all kinds.
A．work off
B．let off
C．play off
D．put off
单项选择题
It would be very difficult for a library to be without dictionaries and encyclopedia; such reference books are______.
A．unavoidable
B．inevitable
C．indispensable
D．fundamental
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