单项选择题

Most of the earliest ______ into America came from Europe.

A．migrants
B．emigrants
C．immigrants
D．inhabitants
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单项选择题
By cutting down trees we ______ the natural home of birds and animals.
A．harm
B．hurt
C．injure
D．damage
单项选择题
Without a (an) ______ passport a tourist is forbidden to enter a country.
A．operative
B．effective
C．valid
D．efficient
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