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
From the news item, we are sure this was at least Rice’s ______ trip to Iraq.
A．first
B．second
C．third
D．fourth
单项选择题
The passage is about ______
A．poison control centers and doctors
B．bathing from a container or in a shower
C．the effect of water temperature on eyeballs
D．first-aid treatment of eye problems
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