单项选择题

A．The lack of help from the town government.
B．The cyclists’ carelessness.
C．The truck drivers’ anger.
D．all of the above.
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单项选择题
A．It has improved animal breeding skills all over the world.B．It has helped relieve hunger in some developing countries.C．It has promoted international exchange of fanning technology.D．It has bridged the gap between the rich and the poor in America.
A．It has improved animal breeding skills all over the world.
B．It has helped relieve hunger in some developing countries.
C．It has promoted international exchange of fanning technology.
D．It has bridged the gap between the rich and the poor in America.
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