题目
5.单选题 For all the wonder of the human body, the development o f modern society has relied very heavily() artificial machine nes to replace muscle power.A. inB. onC. at
5.单选题 For all the wonder of the human body, the development o f modern society has relied very heavily() artificial machine nes to replace muscle power.
A. in
B. on
C. at
题目解答
答案
B. on