题目

种植某种树苗,这种树苗的成活率为0.9,若种植这种树苗5棵,用模拟试验的方法求恰好成活4棵的概率. 答案：【解析】利用计算器（或计算机）产生0~9之间的整数随机数.我们用0代表不成活,1至9这9个数字代表成活,这样可以体现成活率是0.9,因为是种植5棵树苗,所以5个随机数作为一组,产生30组随机数: 69801 66097 77124 22961 74253 31516 29747 24945 57558 65258 74130 23224 37445 44324 33315 27120 21728 58555 61017 45241 44134 92201 70362 82005 94796 This is my beautiful home. There is a small garden in front of my house. There are many beautiful flowers in the garden. Behind my house there is a big tree. Near the tree, you can see a garage. My father’s beautiful car is in it now.On the first floor, there is a large living room, a dining room, a kitchen and a bathroom. I like watching TV in the living room. On the second floor, there is a small study room and two bedrooms. I love playing with the computer in my study. What a nice home! I like it very much.【小题1】There is a small garden       my house.A．behindB．in front ofC．next toD．across from【小题2】There is _______on the first floor.A．a studyB．a bedroomC．a bathroomD．a computer【小题3】The computer is in the ___________A．study roomB．bedroomC．living roomD．dining room【小题4】There is ______in the garage.A．a nice carB．a living room C．a dining room D．a kitchen