单项选择题

A．Pollution of the environment.
B．Over-killing by hunters.
C．Destruction of their natural homes.
D．A new generation of pest killers.
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单项选择题
English iron smelters and English iron manufacturers were both opposed to _______.
A．high import taxes on American pig iron
B．the growth of iron manufacturing in America
C．the shipping of iron products to America
D．selling English wool to the colonists
单项选择题
A．They are less likely to run away.B．It’’s easier for their masters to train them.C．They are less likely to be shy with human beings.D．It’’s easier for them to form a relationship with their masters.
A．They are less likely to run away.
B．It’’s easier for their masters to train them.
C．They are less likely to be shy with human beings.
D．It’’s easier for them to form a relationship with their masters.
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