题型：名词解释 读一读，选一选。( ) 1. This is my brother, Dayong! ( ) 2. How old are you? ( ) 3. How are you?( ) 4. Today is my birthday.A. I'm six.B. Nice to meet you!C. Happy birthday!D. I'm fine, thank you. 查看答案
题型：名词解释 油井水泥由（）四种化合物组成。A、硅酸三钙、硅酸二钙、铝酸四钙、铁铝酸四钙B、硅酸三钙、硅酸二钙、铝酸三钙、铁铝酸二钙C、硅酸四钙、硅酸二钙、铝酸三钙、铁铝酸四钙D、硅酸三钙、硅酸二钙、铝酸三钙、铁铝酸四钙 查看答案