Robots differ from automatic machines ________ after completion of one specific task，they can be reprogrammed by a computer to do another one.
B
inthat意思是：在于，因为。解释differfromautomaticmachines的具体方面。
A year later，with the nation’s economy ________，Bush’s approval rating dropped below 40 percent
Robotsdifferfromautomaticmachines________aftercompletionofonespecifictask，theycanbereprogrammedbyacomputertodoanotherone.
Since we have a focused subject ，we should not talk ________.