题目

听材料，回答问题。 （1） Who might the man be? A . A student. B . The woman's son. C . An interviewee. （2） What should people open with when writing a business e-mail? A . The receiver's name. B . The sender's signature. C . A greeting. （3） What does the woman advise the man to do? A . write a long e-mail. B . Divide the e-mail into paragraphs. C . Limit the e-mail to one paragraph. （4） How does the woman advise the man to edit e-mail? A . Edit the letter in the Microsoft Word first. B . Add smiley in the business e-mail. C 如图，OABC是一张放在平面直角坐标系中的长方形纸片，O为原点，点A在x轴的正半轴上，点C在y轴的正半轴上，OA=10，OC=8，在OC边上取一点D，将纸片沿AD翻折，使点O落在BC边上的点E处，求D、E两点的坐标．