单项选择题

______ was believed to be responsible for the blasts.

A．Local Basque police
B．Those supporting government's policy
C．separatist ETA group
D．Those opposing government' s policy
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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'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.
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