题目

介绍一下自己的书包，可选用以下单词：light broken heavy big small hardMy Schoolbag 答案：My Schoolbag I have a big schoolbag. It's blue. It's got a lovely white rabbit on it. It's got four pockets. There are so many books in it. It's very heavy. It's old and broken，but I like it very much.下列说法正确的是                                                                                        （   ）A．二氧化硅用来制造通讯材料一光导纤维B．沙子、石英的主要成分是单质硅C．SiO2可与盐酸发生反应D．自然界里大量存在单质硅、二氧化硅和硅酸盐