题目

—I would like you to talk about the Great Wall.—I’m sorry, but _________ Jack _________ I have been there.A. either; or B. neither; nor C. both; and D. not only; but also 答案：【答案】B【解析】试题--我想让你来谈谈长城。--对不起，我和杰克都没去过那里。either...or...“或者······或者······”；neither...nor...“两者都不”；both...and...“两者都······.”；not only; but also“不仅······而且······”。只有neither表示否定，符合句意。故选B。在图甲所示的电路中，当开关S从2转到1时，根据电流表和电压表对应的示数，在U-I坐标中描绘了相对应的坐标点，如图乙所示，电源电压是 ，电阻R1的阻值是 ，电阻R2的阻值是 ．