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．To impose restrictions on further immigration.B．To improve the working conditions of immigrants.C．To set a minimum wage level for new immigrants.D．To put requirements on languages for newcomers.
A．To impose restrictions on further immigration.
B．To improve the working conditions of immigrants.
C．To set a minimum wage level for new immigrants.
D．To put requirements on languages for newcomers.
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