题目

下列说法中正确的是                                          (   )     A．光是沿直线传播的     B．太阳光射不到影子里，是因为光在同一种均匀介质中传播路径是直的     C．太阳和月亮都是光源     D．小孔成像实验中，孔越大，像越清楚 答案：B I like this jacket better than that one, but it costs almost three times______. A. as much    B. as many    C. so much    D. so many