黑龙江省伊春市2015阅读理解暑假作业（7）及答案（
高考英语） 阅读理解。 the cave crawler mining robot why do human beings still risk their lives under ground and doing one of the dirtiest and most dangerous jobs in the world? it’s an increasingly urgent question ,given the recent high-profile(引人注目的)mining accidents in sago, w. va., and huntin gton, utah. a small group of engineers and robotics experts envision(
