听力题
单选题
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
【正确答案】
D
【答案解析】
单选题
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.
【正确答案】
B
【答案解析】
提交答案
关闭