D 【试题分析】 本题涉及的O2和Cl2都是典型的非金属单质,都具有较强的氧化性,但它们跟某些金属或非金属反应的条件和产物存在着许多不同。铁在氧气中燃烧可直接生成Fe3O4;铁与氯气直接反应只生成FeCl3;H2在Cl2中燃烧或H2和Cl2混合后经光照均可直接生成HCl;磷在氯气中燃烧可生成PCl3。所以只有FeCl2不能由Fe和Cl2直接反应得到。
Some people seem to have a secret for learning language. They can pick up new vocabulary, master rules of grammar, and learn to write in the new language __1__than others. Perhaps if we take a close