The chief mineral products of the United States are in order of value, _____ .
A、petroleum, natural gas, and coal
B、natural gas, petroleum, and coal
C、coal, petroleum, and natural gas.
D、coal, natural gas, and petroleum
【正确答案】：A
【题目解析】：美国的主要矿产品按价值排序是:石油、天然气和煤。
