题目

The sunlight came in ____the windows in the roof and lit up the whole room.A. through               B. across                    C. on                               D. over 答案：A15．a、b都是大于0 的自然数，如果$\frac{2}{3}$a=0.5b，则（　　）A．a＞bB．a＜bC．a=bD．无法判断