单项选择题

Concrete is used in extensive projects because of ______.

A．the increase in traffic
B．the cost of other materials
C．the change of the climate
D．the construction of the roads
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单项选择题
Last year exports to China was boosted by ______.
A．25 percent
B．24 percent
C．23 percent
D．22 percent
填空题
∧ history purely：
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