单项选择题

What are the speakers mainly discussing

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．privilegesB．promotionsC．prioritiesD．emotions
A．privileges
B．promotions
C．priorities
D．emotions
单项选择题
What’s one of the sources of oceanic salinity mentioned in the talk
A．Seaweed found in kelp(大海藻)beds.
B．Industrial waste.
C．Meteorties.
D．Underwater volcanoes.
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