单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．In a company.
B．In a studio.
C．In a classroom.
D．At the woman’s hom
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单项选择题
A．Write comments on the others’ works.B．Give advice to each other.C．Write poems.D．Publish new works.
A．Write comments on the others’ works.
B．Give advice to each other.
C．Write poems.
D．Publish new works.
单项选择题
According to Paragraph 1, we can learn that ______.
A．scientists have made certain achievements in HIV vaccine
B．HIV vaccine has been proved successful ultimately
C．HIV vaccine has been proved useless
D．HIV has already been decoded and defeated
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