单项选择题

A．It can be used by farmers to protect large buildings.
B．It was brought to the northern USA by Asian farmers.
C．It has done more harm than good in the southern USA.
D．It was introduced into the USA to kill harmful weeds.
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单项选择题
A．He was attracted by Mrs Jones.B．He had heard a noise.C．He had run out of gas.D．His tyres were punctured.
A．He was attracted by Mrs Jones.
B．He had heard a noise.
C．He had run out of gas.
D．His tyres were punctured.
单项选择题
A．The usher.B．The people sitting next.C．The people sitting in front of him.D．The people standing in the back.
A．The usher.
B．The people sitting next.
C．The people sitting in front of him.
D．The people standing in the back.
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