题目

用显微镜观察洋葱表皮细胞，第一次使用目镜为10×，物镜10×；第二次使用目镜为12×，物镜为45×，那么第二次观察到的情况与第一次相比（ ） A . 视野亮，细胞数目多 B . 视野亮，细胞数目少 C . 视野暗，细胞数目多 D . 视野暗，细胞数目少 答案：DHis mother was pleased ________ the news that the manager was pleased ________ he had done.A.at, with whatB.at, withC.with, at whatD.with, at that