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
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单项选择题
What does the man mean
A．The milk is safe to drink.
B．The milk is not safe to drink.
C．She shouldn’’t have bought the milk.
D．He wouldn’’t have milk for breakfast.
单项选择题
The passage is mainly about______.
A．what dogs can do.
B．how to keep dogs.
C．dogs and their masters.
D．reasons for keeping dogs.
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