题目

下列说法正确的是 A．依据丁达尔现象可将分散系分为溶液、胶体与浊液 B．二氧化硅的分子式是SiO2 C．单质硅是将太阳能转变为电能的常用材料 D．漂白粉和水玻璃长期暴露在空气中变质，能用同一原理解释 答案： I don’t know if ______ to the party. I will let you know if ______.       A. he will come; he comes                   B. he will come; he will come       C. he comes; he comes                     D. he comes; he will come