题目

用括号内所给动词的正确时态填空。 1. They _________(get) to school early every day. 2. We _________(visit) your factory next week. 3. What time _________ you _________(leave) yesterday? 4. —_________ they _________(walk) to work this afternoon? —No, they won't. 5. He _________(drink) some water and began to speak. 6. Look! The kids _________(swim) in the river. 7. I'm afraid I _________(have) a cold tomorrow. 8. I hear she _________(be) twenty years old next year. 9. He _________(write) to me as soon as he arrives in Shanghai. 10. The boys _________(laugh下列设备没有利用连通器原理的是( ) A. 茶壶 B. 船闸 C. 活塞式抽水机 D. 热水壶的水位计 C 【解析】上部开口，底部连通的容器，叫连通器。 题中，茶壶、船闸、水位计都符合连通器的结构特点，利用了连通器的原理； 而活塞式抽水机利用大气压工作，没有利用连通器的原理。 故C符合题意。