题目

This kind of cloth__________well.I think it is worthy__________. A . washes; buying B . is washed; buying C . washes; to be bought D . is washed; to be bought 答案：C凸透镜甲焦距是10厘米，凸透镜乙焦距是20厘米，物距相同时，同一物体所成的像，可能的情况是A.都成倒立的放大的实像B.都成倒立的缩小的实像C.甲成倒立、放大的实像，乙成倒立、缩小的实像D.甲成倒立、缩小的实像，乙成倒立、放大的实像