单项选择题

A．Sewage and industrial waste.
B．Oil pollution on the beach.
C．Oil discharged at sea when people cleaning oil tanks.
D．The oil that leaks out after ship collisions.
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单项选择题
A．They eat huge amounts of food.B．They usually eat twice a day.C．They usually eat to their hearts’’ content.D．They eat much less than people assume.
A．They eat huge amounts of food.
B．They usually eat twice a day.
C．They usually eat to their hearts’’ content.
D．They eat much less than people assume.
单项选择题
A．He’’s studying for a test.B．He lost his notes.C．He missed the class.D．He’’s doing research on alternative.
A．He’’s studying for a test.
B．He lost his notes.
C．He missed the class.
D．He’’s doing research on alternative.
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