单项选择题

A．Two.
B．Three.
C．Four.
D．Five.
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A．It has done more harm than good in the southern USA.B．It was brought to the northern USA by Asian farmers.C．It was introduced into the USA to kill harmful weeds.D．It can be used by farmers to protect large buildings.
A．It has done more harm than good in the southern USA.
B．It was brought to the northern USA by Asian farmers.
C．It was introduced into the USA to kill harmful weeds.
D．It can be used by farmers to protect large buildings.
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