互動封閉仿真課堂1、智能交互 2、電子板書式視頻教學 3、5分鐘一次互動問答 4、封閉課堂
I decided that I ought to go out and have 44 in the yard, just in case someone was 45 . I got a flashlight and a stick, which I thought might be useful. With these in my hands, I went out 46 the yard. Once again I heard the cry and this time there was no doubt that it came from the trees at the far end of the yard. “Who is there?” I 47 as I walked across the yard towards the trees. But there was no 48 . With the help of my flashlight, I 49 all over that end of the yard, including the branches of the trees. There was no 50 of anybody or anything. I came to the conclusion that my 51 made fun of me, probably because of the strange creatures (生物) on another 52 which I read about in the story.