资料：最后，大家谈论了中国在绿色经济方面做出的杰出贡献，请根据下列资料回答问题。
On behalf of the organizing committee, we cordially hope you can join us at the Low Carbon Earth Summit-2011, with a theme of “Leading the Green Economy, Returning to Harmony with Nature”, which will be held during October 19-26 , 2011 at World Exposition Center, Dalian, China. As far as we know, your work in this field is a clear example of the leadership, so we would like to highlight your effort at our conference and hope you can give a speech at track 7-8-28: Anaerobic Biotechnology for Bioenergy Production.
The purpose of LCES-2011 is to provide a wold-class meeting place for information exchanges and trade fair for promoting Low Carbon Economy. It will take the form of plenary lectures, oral presentations, posters, exhibitions and project matchmaking. LCES-2011 will support new business development with the opportunity to learn from one another’s experiences in this field, identify ways to play an even more active role in control of global climate change, and seize further green investment opportunities for innovators and entrepreneurs worldwide.
Lastly, we would like to urge you not to miss this historical initiation and actively join us with your great passion and contributions. Hope to see you in Dalian in the golden fall season.
Which type of writing does the passage belong to?（ ）
本题考察的是细节理解。
【关键词】type of writing
【主题句】
第1自然段On behalf of the organizing committee, we cordially hope you can join us at the Low Carbon Earth Summit-2011, with a theme of “Leading the Green Economy, Returning to Harmony with Nature”, which will be held during October 19-26 , 2011 at World Exposition Center, Dalian, China.我们代表组委会，诚挚邀请您参加2011年低碳地球峰会。本次峰会的主题是“引领绿色经济回归和谐自然”。本次峰会将于2011年10月19日到26日在中国大连世界博览广场举行。
【解析】本题问的是“本文属于哪种类型文章？”选项A apology“道歉”；选项B advertisement “广告”；选项C invitation “邀请”；选项D memo“备忘录”，根据主题句，结合文意，故C选项正确。
下列关于公司的表述，正确的是（）
以下各项列举了我国常见气象灾害与其发生地区的对应关系，其中正确的一项是（）
根据电视收视率调査，看体育节目的观众中青年人比中老年人要多。
由此可推断出（）
—种海洋蜗牛产生的毒素含有多种蛋白，把其中的一种给老鼠注射后，会使有两星期大或更小的老鼠陷入睡眠状态，而使大一点的老鼠躲藏起来。当老鼠受到突然的严重威胁时，非常小的那些老鼠的反应是呆住，而较大的那些老鼠会逃跑。
以上陈述的事实最有力地支持了以下哪项假说？（）
疾病控制中心对某校髙中三个年级的学生进行抽样做视力状况调查，抽样的方法为分层抽样（按比例抽样），若高中一、二、三年级学生人数分别为626、703、780，样本容量为84，则应从离二年级抽样的学生人数为多少？（）
