A:硅在自然界中既有游离态又有化合态
B:高温下SiO2能与Na2CO3固体反应生成Na2SiO3和CO2,说明硅酸酸性强于碳酸
C:因为玻璃中含有SiO2,所以不能用磨口玻璃塞的试剂瓶盛装碱性溶液
D:SiO2能与氢氧化钠溶液和氢氟酸反应,所以SiO2是两性氧化物
根据短文内容及首字母提示完成短文。
My name is John. I am 13 years old. My b ____is 1st October and I was b____ in Nanjing. I live with my f____ in Shanghai. I have a t____ brother. I am s____ and I w____ glasses. I am good at English. I like playing football. I play football in the football f____. I also like c____ games. In the evening, I do my homework carefully. My father r____ newspapers. My mother c____dinner for us. My brother reads Chinese books every day.
下列计算正确的是( )