题目

Mauritius, with its full name the Republic of Mauritius, an island country, lies 1,200 miles off the southeastern coast of Africa, and just east of Madagascar, another African island country, which is larger by far than Mauritius. It covers 788 square miles and has a population of 1,00,000, about 750.000 Indians, 300,000 Chinese and 20,000 Whites included. They are living together peacefully, although they share such different beliefs as Hindu, Roman Catholic, Muslim and so on.The country can be divided into many parts with different climate all because of its peculiar terrains (地形). In th3．第28届国际地质大会提供的资料显示，海底蕴藏着大量的天然气水合物，俗称“可燃冰”．“可燃冰”是一种晶体，晶体中平均每46 个H2O 分子构建成8 个笼，每个笼可容纳1个CH4分子或1个游离的H2O 分子．若晶体中每8 个笼有6 个容纳了CH4分子，另外2个笼被游离H2O分子填充．则“可燃冰”的平均组成可表示为（　　）A．3CH4•H2OB．CH4•3H2OC．CH4•6H2OD．CH4•8H2O