题目

现有9种物质：①二氧化碳②洁净的空气③铁水④冰水混合物⑤澄清石灰水⑥锰酸钾⑦氧气⑧四氧化三铁⑨矿泉水．其中属于单质的是 （填序号，下同），化合物的是 ，纯净物的是 ，混合物的是 ，氧化物的是 ． 答案：【考点】单质和化合物的判别；从组成上识别氧化物；纯净物和混合物的判别． 【分析】物质分为混合物和纯净物，混合物是由两种或两种以上的物质组成；纯净物是由一种物质组成．纯净物又分为单质和化合物．由同种元素组成的纯净物叫单质；由两种或两种以上的元素组成的纯净物叫化合物．氧化(改编)Mrs. King is an American doctor. She is now in China. She works in a children’s hospital（儿童医院）in Beijing. She is also learning Chinese medicine (中医) there. She likes Chinese medicine very much. She loves working for children. She works hard in the day and reads English books on (关于) Chinese medicine at night. She learns Chinese from the Chinese doctors and her Chinese friends. Now she can speak some Chinese. She can read some Chinese books, too.Her husband Mr. King is a teacher. He teaches English in a junior high school in Beijing. He works hard, too. He works from Monday to Friday. He teaches three classes every day. Sometimes, on Saturdays and Sundays, he teaches other English classes. He wants to make more money (挣更多钱).根据短文内容，选择正确答案。【1】Mr. King works in a _____.A. shopB. junior high school in BeijingC. hospital in BeijingD. hospital in America【2】Mr King works _____.A. in a junior high school in BeijingB. in a children’s hospital in BeijingC. in a junior high school in AmericaD. in a children’s hospital in America【3】 Mrs. King works _____.A. in a junior high school in BeijingB. in a children’s hospital in BeijingC. in a junior high school in AmericaD. in a children’s hospital in America【4】Mrs. King learns Chinese from _____.A. her teacher B. the booksC. the doctors D. the Chinese doctors and her Chinese friends【5】 Which of the following sentences is NOT true?A. Mrs. King can speak English and Chinese.B. Mrs. King doesn’t know anything about Chinese medicine.C. Mrs. King is from America.D. Mr. King sometimes teaches other English classes on weekends.