题目

Floating on the surface of the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They move about lazily with the currents, providing a basic food for many larger animals. Plankton has been described as the equivalent (相等的东西) of the grasses that grow on dry land, and the comparison is an appropriate one. In potential food value, however, plankton far outweighs that of land grasses. One scientist has estimated that while grasses of the world produce about 49 billion tons of valuab 多彩的“碳”,多姿的生活,让我们一起走进“碳”的世界: (1)“碳海绵”是已知最轻的固体材料(如图所示),由碳元素组成,具有多孔结构,弹性好。它对石油有很强的吸附能力(不吸水),将吸入的石油挤出后仍可恢复原状。下列关于碳海绵的说法不正确的是                (填字母序号)。 A.具有吸附性                            B.不可重复使用 C.可处理海上石油泄漏 (2)目前,人类以煤、石油、天然气等含碳的化石燃料为主要能源。请从下列表格中分析,与煤相比,用天然气做燃料的优点是                                        。 1g物质完全燃烧 产生二氧化质量/g 放出热量/kJ 甲烷 2.75 56 碳 3.67 32 请写出天然气燃烧的化学方程式:                                     (2分) (3)过多的二氧化碳会加剧温室效应,但另一方面二氧化碳也是一种宝贵的资源。液态二氧化碳灭火器可用于扑救档案资料室发生的火灾,这是因为                。(2分)
英语 试题推荐