假定英语课上老师要求同桌之间交换修改作文,请你修改同桌写的以下作文,文中共有10处语言错误,每句中最多有两处,错误涉及一个单词的增加、删除或修改。 增加:在缺词处加一个漏字符号(∧),并在此符号下面写出该加的词。 删除:把多余的词用斜线(﹨)划掉。 修改:在错的词下画一横线,并在该词下面写出修改后的词。

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。

Boys and girls,

    May I have your attention, please?

    There will a lecture in our library, at 4:00 on Wednesday afternoon. We are very honour to have invited Professor Tang Wenfang, who has been studied cultural differences in Tsinghua University for many years, in talk about the differences between American and Chinese cultures, that may be quite an interested topic. After a lecture, you are welcome to share your experience in China with everyone else present. Since you have stayed in China for half a year, because you have anything that what puzzles you, it would be great to talk with Mr.Tang. He will be glad to communicate with you. Please be present on time.

    That's all. Thank you.

肾单位形成的尿液，排到体外的途径依次是（　　）

2016年9月，在杭州召开的G20峰会围绕“构建创新、活力、联动、包容的世界经济”主题，在中国主导和推动下，在推动创新增长，深化结构性改革，加强基础设施互联互通，促进国籍贸易投资等方面取得重要成果，这表明中国（    ）

①坚定不移坚持对外开放的基本国策  ②已经成为一个可以主导国际事务的发达国家

③参与全球经济治理的积极意愿          ④是一个和平、合作、负责任的大国

下图为某区域R河流域图，读图，完成以下问题。