题目

 根据句意和所给中文写出句中所缺的单词。 1. May I __________(介绍) my best friend Amy to you, Sandy? 2. I think it’s our_________(职责) to protect the environment. 3. The cinema has________(出口) on its three sides. 4. Will you please pay________(注意力) to what I am saying? 5. How many __________(客人) were there in yesterday’s party? 答案：1. introduce 2. duty 3. exits 4. attention 5. guests在北方的冬季，常见的几种物态变化现象中，属于凝华的是（　　）A．室外冻冰的衣服变干B．房间窗户玻璃的内表面出现冰花C．湖面结了厚厚的一层冰D．正在跑步的人，口中呼出“白气”