1) Which indicates air pollution ? a) b) c) d) e) 2) Which indicates chemical waste pollution ? a) b) c) d) e) 3) Which indicates water pollution ? a) b) c) d) e) 4) Which one is waste of water ? a) b)   c) d) e) 5) Which one is about unnecessary tree cutting ? a) b) c) d) e)

ENVIRONMENT PROBLEMS

由
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？