题目

冬天用煤或木炭取暖一定要注意安全，防止煤炭或木炭因为燃烧不充分产生 使人中毒；用电热器取暖要注意不要超过用电负荷，以防止发生电路短路引起火灾，如果电器负荷过重引起的火灾绝对不能用 灭火，这样易发生触电的危险． 答案：【1】 一氧化碳或CO 【2】水用所给动词的适当形式填空。1. He             (enjoy) every year of junior high school.2. Don't forget______ (close) the windows when you leave the classroom.3. Would you please   ____  (not sit) on the desk?4. Mr Li   _____ (teach) here since 1987.5.  He would never think of______(let) his daughter marry a fellow like you.