【简答题】用所给动词的适当形式填空 1. Listen! The children (sing) in the classroom. 2. We enjoy (play) football in the aftemoon. 3. you (cook) when he knocked at the door? 4.He said he (borrow) my pen the day after tomorro...
【简答题】听下面一段材料,回答第1-3题。 1. What did the woman think the boy was going to do today? A. Play football. B. Trade stamps. C. Visit a friend. 2. When did the woman stop collecting stamps? A. Over a decade ago. B....
【简答题】连线。 1. Water 2. Eat 3. Play 4. Go to A. some noodles. B. the flowers. C. the playground. D. football.
【单选题】使 pH 玻璃电极产生钠差现象是由于
B.
强碱溶液中 氢氧根离子 中和了玻璃膜上的 氢离子