Ⅰ.阅读理解
Robots have proven very useful in different situations.But those robots are small remote-controlled tanks with a mechanical arm,and they can get hung up on narrow stairwells(楼梯井) and are stopped by ladders.“A lot of the places where you do disaster recovery are only accessible for people,”says Marc Raibert,the president of Boston Dynamics,which is providing advice and help for Defense Advanced Research Projects
