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
It's true that the old road is less direct and a bit bumpy. We won't take the new one ______because we feel as safe on it.
A．however
B．though
C．nevertheless
D．whatsoever
单项选择题
______that a society like the National Society for the Prevention of Cruelty to children is still needed in a civilized country.
A．How does it come
B．How it comes
C．How did it come about
D．How did it come
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