题目

 One minute he burst into_______ and the next burst out_______. We just couldn’t catch her mood at any moment.  A. crying; laughter                  B. tears; laughing                                                    C .tears; laughter               D. crying; laughing 答案：B按要求完成下列的光路图：（1）完成图1的反射光路图；（2）完成图2的折射光路图．