题目

Danish was a very lazy girl. Her mother always asked her to learn to read, __1 __she didn't.It was disappointing.Her mother was __2__ about that.One morning,Dinah just __3__ and was looking through the window.She saw her cousin skating on the __4__.He was wearing a pair of shoes she had never __5__ before.It was a pair of roller-skates(旱冰鞋).Dinah thought it was interesting to __6__ on the street.She got up quickly and went outside.She asked her cousin if she __7__ try his shoes on.Her cousin said to her,”I know that your __8__ has been asking you to learn to rea 在图中,导体A、B是由同种材料做成的,A和B等长,但A比B的横截面积大,当S闭合后,在相同时间内,下列叙述正确的是(  )   A. 电流通过A、B所做的功是WA>WB   B. 电流通过A、B所做的功是WA<WB   C. 电流通过A、B所做的功是WA=WB   D. 无法比较电流通过A、B时做功的大小
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