单项选择题

Trees that______the view of the oncoming traffic should be cut down.

A．block
B．inhibit
C．spoil
D．alter
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单项选择题
A considerable amount of time and money has been invested in______this system.
A．defining
B．implying
C．reducing
D．perfecting
单项选择题
The Untied States and Canada are lands of______except for the Indians, who are the only true natives.
A．emigrants
B．immigrants
C．dwellers
D．inhabitants
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