单项选择题

In the old days dogs were used for the following EXCEPT______.

A．hunting other animals.
B．driving sheep.
C．guarding chickens.
D．keeping thieves away.
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单项选择题
The poxvirus vaccine is aimed to________.
A．form immunity to HIV and AIDS virus
B．help the body’’s antibodies
C．help the body’’s cells
D．strengthen the body’’s immunity
单项选择题
What is NOT a change to the literature class
A．Class location.
B．Class times.
C．Class length.
D．Class size.
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