题目

_________ the road round to the right, the blind man asked a boy to guide him.    A. Follow     B. Following     C. To follow     D. Followtec 答案：C如图所示，L1和L2是两只相同的小灯泡，当开关S闭合后，电流表的示数（ ）A．A1示数为零，A2示数变大B．A2是A1示数的两倍C．A1和A2的示数仍相等D．A1示数不变，A2示数变大