A:遭受水蚀
B:沙漠化
C:盐渍化
D:受到污染
(Ⅰ)求B,C两点间的距离(结果精确到1m);
(Ⅱ)若规定该路段的速度不得超过15m/s,判断此轿车是否超速.
参考数据:tan31°≈0.6,tan50°≈1.2.
It seems very difficult to ________ the child crying. Please take him to his mother.