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
According to the author, cats ______.
A．are not domestic animals at all
B．are fiercer than dogs
C．are both meek and independent
D．can sometimes be very hostile to people
单项选择题
Dogs and cats are similar in that ______.
A．people can use them for hunting
B．they are associated with man closely
C．they have the same way of living
D．they are equally liked by people
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