题目

金刚石、石墨、C60都是碳元素组成的单质，关于它们的说法不正确的是（ ） A．碳原子的排列不同 B．化学性质相似 C．完全燃烧都生成二氧化碳   D．是同一种物质 答案：【考点】碳元素组成的单质． 【专题】碳单质与含碳化合物的性质与用途． 【分析】根据金刚石、石墨、C60的元素组成，物理性质的差异来回答本题 【解答】解：A、金刚石是自然界中最硬的物质之一，石墨是最软的矿物之一，二者都是由碳元素组成，为什么物理性质相差这么大，主要是由于构成它们阅读下列材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。God has blessed me with a lovely brother. He is 4 years younger than me. I still remember the scene ____1.____ he was born . When he was a little baby, he always used to cry for no reason and hardly slept. He never allowed me and my parents ____2.____ (sleep) well.With time _____3.___(go) by, he became a little older. He used to enjoy __4.__ by snatching(抢) all my toys away from me. As a result ,I was always angry .__ 5.___ , my parents said that he wasn’t __6._____(blame) as my younger brother and I should make him learn to share things.Now, although we still fight over things, we both love each other ____7.____(deep). We share the same school and have the same __8.__, like doing sports, singing and reading.We do a lot of secret things without informing our parents and if __ 9.__(catch), we will join hands to deal with the situation. Life is fun when we are together. As we are growing old day by day, we are becoming ___10.___ (responsibility) for our duties than before. And we know that no matter where we go in life, we both are always there for each other to face the hardships of life.