单项选择题

Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．Grassland for animals.
B．A land covered with trees.
C．A steep slope of a hill.
D．A land with fertile soil.
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单项选择题
A．Take the wallet to the reception desk.B．Look for the owner of the wallet in the company.C．Ask the receptionist for help.D．Put the wallet back in the elevator.
A．Take the wallet to the reception desk.
B．Look for the owner of the wallet in the company.
C．Ask the receptionist for help.
D．Put the wallet back in the elevator.
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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