A,C,D,C,B,D,D,B,A,C,D,B,A,C,C,D,C,B,C,D,C,A,D,B,D,B,B,C,A,D,C,were pretty dumb. They worked like clocks and did the same things _64_Now modern robots dont always _65_ people. Some are like big machines；others are nothing but long arms attached to boxy(箱子般四四方方的) bodies. However，modern robots are smart. Some can solve(解决) _66_ on their own. Their brains are computers and their eyes are sensors(传感器)Motors(发动机) help them _67_In the future，robots will learn from their mistakes more than they do now.They will be _68_,
