题目

. _____ by the advances in technology, many farmers have set up wind farms on their land. A. Being encouraged                             B. Encouraging C. Encouraged                                  D. Having encouraged 答案：C（2011?闵行区一模）如图所示的电路中，电源电压恒定不变，R1=R2．当电键S1闭合、S2断开时，电流表、电压表的示数分别为I1、U1；当电键S2闭合、S1断开时，电流表、电压表的示数为I2、U2；则I1/I2==1，U1/U2＜＜1（选填“＜”、“=”或“＞”）．