题目

The footballer didn’t succeed in scoring，though________several chances by his teammates. A．was given                            B．being given C．giving                               D．given 答案：D为保持空气的洁净、清新，下列做法不正确的是（ ）A. 农民把秸秆粉碎还田，作为肥料 B. 农村用沼气、城市用天然气做饭C. 坐私家车上班、上学，减少拥挤 D. 植树造林，保持水土