A-A+
Concrete is used in extensive projects because
问题详情
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
参考答案
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。
