题目

Reading is very important. World Book Day falls on April 23 every year. It encourages people, especially teenagers, to discover the pleasure of reading. It is also the day to honor (尊敬) great writers.Many countries celebrate (庆祝) World Book Day. On that day, millions of school children can buy books at a much lower price than usual in any bookstore in England. It has been done every year since 1998. World Book Day is also celebrated in China. Wen Jiabao, Premier of China, is an avid reader. He does lots of reading every day though he is very busy. On World Book Day 2009, he called on (下面有关晶体的叙述中，不正确的是A．金刚石网状结构中，由共价键形成的碳原子环中，最小的环上有6个碳原子B．氯化钠晶体中，每个Na＋周围距离相等的Na＋共有6个C．氯化铯晶体中，每个Cs＋周围紧邻8个Cl－D．干冰晶体中，每个CO2分子周围紧邻12个CO2分子