题目

下列说法错误的是（） A . 金属钠与水反应熔成小球说明其熔点很低 B . 用小刀切下一小块金属钠说明其硬度小 C . 液态氯化氢和熔融氯化钠中都含有自由移动的 ， 且都能导电 D . 氯气化学性质活泼，在自然界中不存在游离态的氯元素 答案：CThis is Jim. He is thirteen. He is from the U.S.A. He is a student. He has a good friend. His name is Jack. Jack is fifteen. He is from Australia. Jack is tall but Jim is short. They are in the same class, but they are in different grades. Jim is in Class Two. Jack is in Class Two, too. They go to school(上学) at seven in the morning and go home(回家) at six in the afternoon. 小题1:Jim and Jack are ____.A．sistersB．friendC．teacher and studentD．from different countries(国家)小题2:Jim and Jack are in ____.A．the same gradeB．different gradesC．the same colorD．the same family(家庭)小题3:Jack is in ____.A．Class 4B．Class 3C．Class 2D．Class 1小题4:They go to school at ____ in the morning.A．6:00B．7:00C．7:30D．8:00小题5:Jim is ____.A．shortB．tallC．strongD．big