题目

 ____ with a difficult situation, Mr Smith made up his mind ____ his boss for advice.      A. Facing; to ask     B. To face; asking   C. Faced; to ask     D. Having faced; asking 答案：C关于显微镜的使用，下列说法中正确的是（　　）A．要看到较多的细胞，需选用较长的物镜和较短的目镜B．外界光线较暗时，要选用大光圈和平面镜C．要使物象更清晰，需调节细准焦螺旋和反光镜D．对光时需要依次转动的是转换器、遮光器、反光镜