题目

下列物质中含有大量自由移动离子的是A. 稀盐酸 B. 氯化钠晶体C. 酒精 D. 石墨 答案：【答案】A【解析】A. 稀盐酸是氯化氢气体溶于水形成的，溶于水的氯化氢分子在水中解离出自由移动的氢离子和氯离子，选项正确； B. 氯化钠晶体中的钠离子与氯离子有序排列，不能自由移动，选项错误；C. 酒精是由酒精分子构成的，不含离子，选项错误； D. 石墨是由碳原子构成的，不含离子，选项Philip was a nine-year-old boy in a Sunday school class of 8-year-old girls and boys. Sometimes the third graders didn’t welcome Philip into their group and usually tricked him. This was not because he was older, but because he was “different”. You see, Philip suffered from a condition called Downs’s Syndrome. This made him “different”, with his facial characteristics, slow responses and mental problems. One Sunday after Easter, the Sunday school teacher gathered some plastic eggs that pulled apart in the middle. The teacher gave one to each child. On that beautiful spring day, the children were to go out and discover for themselves some symbol of “new life” and place it inside the plastic eggs. After the children returned to the classroom, the teacher opened their eggs one by one, asking each child to explain that symbol of “new life”. The first opened egg contained a flower. Everyone cheered. In another was a butterfly…. When the teacher opened the last egg, it was empty. “That’s stupid,” said someone. The teacher felt a pull at his shirt. It was Philip. Looking up, Philip said, “It’s mine. I did it. It’s empty. I have new life, because the tomb is empty.” Not a sound was heard in class at all. From that day on, Philip became a real part of the group. They welcomed him, and whatever made him different was never mentioned again. Philip’s family knew he wouldn’t live a long life, for there were too many things wrong with him1.The underlined word “condition” in the first paragraph probably means ________A.gradeB.statusC.healthD.disease2.It can be inferred from the first paragraph that ________A.The 8-year-olds were sometimes cruelB.The 8-year-olds were friendly to PhilipC.Philip was really different in schoolD.Philip was older and more sensitive3.The teacher gave each child one plastic egg to let them ________A.play around on that beautiful spring dayB.put some symbol of “new life” into itC.try to pull it apart in the middleD.go out and discover themselves4.After Philip explained his new life, ________A.The class thought he was cleverB.The class fell silentC.He began to study in the classD.He felt dying5.We learn from the passage that ________A.The teacher used to have classes outdoorsB.The Philip’s new life wish was emptyC.Philip was healthy as a wholeD.Philip was accepted by his classmates in the end