单项选择题

What is one of the sources of the oceanic salinity mentioned().

A. Seaweed found in kelp beds.
B. Industrial waste.
C. Meteorites.
D. Underwater volcanoes.

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单项选择题
How many meetings are mentioned in the news().

A. 1.
B. 2.
C. 3.
D. 4.
单项选择题
What does the speaker say about the ocean’s level of saltiness().

A. It is measured annually.
B. It is highest at the ocean’s surface.
C. It has increased over time.
D. It has decreased over time.
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