题目

第二节 情景对话（共5小题，每小题1分，满分5分） 根据对话情景和内容，从对话后所给的选项中选出能填入每一空白处的最佳选项，并在答题卡上将该选项涂黑。选项中有两个为多余选项。 A: Some of our friends are going to Britain for the summer vacation．Will you join them? B :    6   ．But I have to go back home to stay with my father because he is badly ill in bed． A : Oh, that’s too bad ! B :    7   A : Yes, my uncle in Hawaii has invited me to spend my vacation with him． B : Great ! Hawaii is a wonderful 为了比较电阻R1和R2的大小，四位同学分别设计了如图所示的电路，其中不可行的是（ ）A．B．C．D．