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's the difference between the two phases of experiments
A．The two kinds of vaccines were vaccinated together on volunteers in the first phase.
B．The two kinds of vaccines will be vaccinated together on volunteers in the second phase.
C．The combined safety of vaccines had been tested in the first phase.
D．The safety of each vaccine will be tested in the second phase.
单项选择题
Whir of the following is NOT mentioned as the tasks confronting Iraqi government
A．Coping with the infrastructure demands.
B．Dealing with the country's safety needs.
C．Drafting a new constitution.
D．Striking the anti-US insurgents.
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