题目

I hope______the child some sweets can make him stop crying.     A. giving              B. give             C. you to give     D. you’ll give 答案：A如图是某光线在空气和玻璃中传播的路径，根据图示判断：PDPD是分界面；入射角是∠CON∠CON；折射角是∠AOM∠AOM；光是从玻璃玻璃斜射向空气空气中．