题目

阅读下文并回答问题。 I'm Sally. I was a shy girl. Bu this term, Idecided to do a brave(勇敢)thing. In this term, we hada new subject to learn— physics. When our teacher asked someone to be thephysics monitor(物理课代表), I put up my hand and gotthe role. But it was not as easy as I thought. At the beginning, I found that many students didnot hand in(上交)their homework, so I was a little worried. I shouted at thestudents. It made the students angry. One girl asked: Why are youshouting at me? You're making it seem like it is all my mistake(错误). Then I found that,it was22、下图是我国历史时期森林植被遭破坏地区分布图。读图回答     图中秦代以前和西汉时期相应地区森林植被遭到破坏的主要原因是 A．气候变化                        B．兴修水利 C．毁林开荒                        D．营造帝王宫殿和陵墓