单项选择题


Passage One
Questions 26 to 29 are based on the passage you have just heard.

A．Reformers’ suggestions.
B．The coming of a large population from Europe.
C．The expansion of industrial cities.
D．The requirement of specific populations.
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A．Grassland for animals.B．A land covered with trees.C．A steep slope of a hill.D．A land with fertile soil.
A．Grassland for animals.
B．A land covered with trees.
C．A steep slope of a hill.
D．A land with fertile soil.
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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