Concrete is used in extensive projects because of ______.A．the increase in trafficB．the co
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已帮助 人
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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正确答案：A
解析：“concrete”为“a constraction material consisting of sand，conglomerate gravel，broken stone，or slag in a mortar or cement matrix”混泥土。