商鞅说:“农、商、官三者．国之常官也。农辟地，商致物．官治民。”“三官贫，必削。”这表明商鞅认为（    ）

增加：在缺词处加一个漏字符号（∧），并在下面加上该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写上修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    When I first came to England, I know little English. As you can probably guess it, my life was difficulty for a time. Simple tasks like ordering food or take a taxi were quite stressful. I signed up for classes and studied on my own as well, so I made poor progress. I became very discouraging. Finally, I found best way to learn English was to make friends with native speakers and spend time with them. I appreciated playing in a band with an English woman which became one of my best friend in London. My English improved great by hanging out with her.

欲将下列物质中所含杂质除去，所选试剂（适量）正确的是（　　）

如图,OABC是一张放在平面直角坐标系中的矩形纸片,O为原点,点A在x轴的正半轴上,OA=10,OC=8,在OC上取一点D,将纸片沿AD翻折,使点O落在BC边上的点E处,求直线DE的解析式.