（）为晶状体前面静止时曲率半径的正常值。
A、10mm
B、6mm
C、7.7mm
D、6.8mm
参考答案：C
Of course she behaved awfully in front of the guests, but ______ she is much younger than him. [ ]
A. as a matter of fact
B. after all
C. above all
D. all in all
一个班学生人数在30～50人之间，分别按6、8和12人分组，学生都正好分完。这个班共有多少人( )
A．24 B．32 C．36 D．48
