题目

    Mr Smith gave his wife money every Friday evening.  His wife always spent it all the next Wednesday, so that for the next three days she had no money to spend at all. One day Mr Smith asked her,“ But how did you spend all that money?” She answered, “I don’t know . ”So one Friday evening, Mr Smith gave her money together with an exercise book and a pencil. He said to his wife ,“Please write down how you spend the money . ”Next Tuesday, his wife had no money again. Mr Smith took the exercise book to see how she had spent it. “I have done what you told me ,”she s当带正电的物体接触验电器的金属球时，金属箔张开，这是因为A.物体中的电子转移到金属箔上B.物体中的质子转移到金属箔上C.金属箔中的电子转移到物体上D.物体中的原子转移到金属箔上