题目

    Rome had the Forum (论坛). London has Speaker’s Corner. Now always-on-the-go New Yorkers have Liz and Bill.     Liz and Bill, two college graduates in their early 20s, have spent a whole year trying to have thousands of people talk to them in subway stations and on busy street comers. And just talk.     Using a 2-foot-tall sign that says, “Talk to Me,” they attract conversationalists, who one evening included a mental patient, and men in business suits.     They don’t collect money. They don’t push religion (宗教). So what’s the point?     “To see wha18．铬单质硬度大，耐腐蚀，是重要的合金材料．（1）基态铬原子的价电子轨道表示式为；CrO2Cl2常温下为深红色液体，能与CCl4互溶，据此判断CrO2Cl2的晶体类型属于分子晶体．（2）配合物CrCl3•6H2O的配位数为6，它有三种不同组成、不同颜色的固体，其中一种为浅绿色固体，该固体与足量硝酸银溶液反应时，0.5mol固体可生成1mol氯化银沉淀，则这种浅绿色固体的配体个数比（Cl-：H2O）为1：5．