单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．Pollution problems.
B．Water supplies around the world.
C．An industrial site in Missouri.
D．Groundwater pollution.
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According to university officials, who are put in an unfavorable situation under early admission programs
单项选择题
A．Light darkens silver salt.B．Light darkens natural salt.C．Light darkens silver.D．Light darkens self-developing film.
A．Light darkens silver salt.
B．Light darkens natural salt.
C．Light darkens silver.
D．Light darkens self-developing film.
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