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单项选择题

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

A．Supporting the soil.
B．Providing shade for animals.
C．Loosening soil structure.
D．Protecting the soil from wind and rain damag
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单项选择题The researchers are now trying to figure out ______.

A．whether observed antibodies can block the infection of HIV
B．whether the combination of vaccines stimulates new molecules
C．whether the combination of vaccines can work well
D．whether the combination of vaccines could be tested in normal people

单项选择题A．Because many of the boys in single parent families are raised by their mothers.B．Because many boys like the stories of women pioneers.C．Because boys are more negative than girls.D．Because many of the boys are from minority populations.

A．Because many of the boys in single parent families are raised by their mothers.
B．Because many boys like the stories of women pioneers.
C．Because boys are more negative than girls.
D．Because many of the boys are from minority populations.