四种基本反应类型中,一定是氧化还原反应的是( ) A . 化合反应 B . 分解反应 C . 置换反应 D . 复分解反应 答案:C
给下列问句选择合适的答语。
( ) 1. What colour is it? ( ) 2. Do you like tigers? ( ) 3. Why are you crying? ( ) 4. What are you going to buy?
A. Because I hurt my finger. B. No, I don't. C. It's brown. D. Ice cream.