Scientists have found _____for oil as fuel. Coal, natural gas, solar power, nuc

题干

Scientists have found _____for oil as fuel. Coal, natural gas, solar power, nuclear power and even water can replace it as sources of energy.

A．consequences	B．substitutes
C．requirements	D．contrasts

上一题下一题 0.85难度单项选择更新时间:2014-10-09 07:04:50

小学学科试题库

初中学科试题库

高中学科试题库