题目

根据句意及所给提示单词。 1 Yang Li and I are in the________ (相同的)school 2 What’s this___________(用英语) 3 —What are __________(那些)？ —They are 4 —__________(几年级)are you in? —I’m in Grade Seven. 5 ___________ (欢迎到)China. 答案：1.same  2.in English   3.those   4.What grade  5.Welcome to 写出以SiO2为原料制备H2SiO3的化学方程式________．