题目

Researchers at the University of Kansas say that people can accurately judge 90 percent of a stranger's personality simply by looking at the person's shoes.“Shoes convey useful information about their wearers”, the authors wrote in the new study published in the Journal of Research in Personality．      Lead researcher Omri Gillath said the judgments were based on the style, cost, color and condition of someone's shoes.  In the study, 63 University of Kansas researchers looked at pictures showing 208 different pairs of shoes worn by the study's participants. Volunteers in the 如图4-2-7所示，理想变压器副线圈通过输电线接两个相同的灯泡L1和L2.输电线的等效电阻为R.开始时，电键S断开，当S闭合时，下列说法中正确的是（    ） 图4-2-7A．副线圈两端的输出电压减小               B．通过灯泡L1的电流减小C．原线圈中的电流增大                        D．变压器的输入功率增大