单项选择题

A．Their taming for circuses and zoos.
B．The destruction of their natural homes.
C．Man’s lack of knowledge about their behavior.
D．The greater vulnerability to extinction than other species.
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单项选择题
A．They might lose control of their members because of the increase in immigration.B．Their members might find it difficult to get along with the newcomers.C．The working condition of their members might deteriorate.D．Their members might lose their jobs to the newcomers.
A．They might lose control of their members because of the increase in immigration.
B．Their members might find it difficult to get along with the newcomers.
C．The working condition of their members might deteriorate.
D．Their members might lose their jobs to the newcomers.
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