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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填空题
From the first paragraph, we can learn the problem with America is that ______.
单项选择题
The achievements for HIV vaccine has been given discount because ______.
A．it causes a number of questions to answer
B．it can’t effectively protect people from HIV
C．it can’t be recognized by the people
D．it is proved ineffective in treating HIV
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