题目

酸雨形成的主要原因是( ) A．汽车排出大量尾气               B．自然界中硫化物分解 C．工业上大量燃烧含硫燃料         D．可燃冰燃烧 答案：CSometimes ________ English is quite different from _______ English in many ways.A．speaking, writingB．spoken, writtenC．speaking, writtenD．spoken, writing