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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 damage.
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单项选择题A．The number of roles human beings play is much more than that of insects.B．The roles human beings play is more important.C．The insects have fewer opportunities to change their roles.D．Different individual performs different functions in human society but not the case in insect society.

A．The number of roles human beings play is much more than that of insects.
B．The roles human beings play is more important.
C．The insects have fewer opportunities to change their roles.
D．Different individual performs different functions in human society but not the case in insect society.

单项选择题A．105.B．115.C．150.D．120.

A．105.
B．115.
C．150.
D．120.