单项选择题

Passage Two
Questions 29 to 32 are based on the passage you have just heard.

A．At 9:00.
B．At 9:15.
C．At 9:50.
D．At 9:30.
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填空题
if the drug proves effective in human trials, it could enhance the effectiveness of existing AIDS drugs in ______.
单项选择题
A．Sunlight.B．Location.C．Soil.D．Drainage.
A．Sunlight.
B．Location.
C．Soil.
D．Drainage.
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