题目

—Please don’t stamp the grass.   —Pardon?   —I ____ stamp the grass. A. tell you don’t                             B. tell you not to C. told you didn’t                            D. told you not to   答案：D下列各项中不会引起大气污染的是．（ ）A．煤的燃烧B．汽车尾气的排放C．工业废气的任意排放D．植树造林