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．＄15,000.B．＄10,500.C．＄14,000.D．＄16,000.
A．＄15,000.
B．＄10,500.
C．＄14,000.
D．＄16,000.
单项选择题
The passage concludes that ______.
A．dogs are more domesticated than cats
B．dogs are more lovable than cats
C．though different, dogs and cats have their own charms
D．both dogs and cats can be kept as pets in one house
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