单项选择题

A．A chemistry assignment.
B．A study that their chemistry professor did.
C．A class that the woman is taking.
D．A job possibility.
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单项选择题
A．The salinity of the ocean.B．Pollutants found at sea.C．The composition of coral reefs.D．The weather patterns of coastal areas.
A．The salinity of the ocean.
B．Pollutants found at sea.
C．The composition of coral reefs.
D．The weather patterns of coastal areas.
填空题
Hanson
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