Speeches about __________ are often more complex than other types of informative speeches.

A、Informative speeches are about objects.

B、Informative speeches are about processes.

C、Informative speeches are about changing people’s beliefs.

D、Informative speeches are about events.

A、Speeches about events

B、Speeches about processes

C、Speeches about subjects

D、Speeches about concepts

A、The business manager explaining next year’s budget.

B、The architect reviewing plans for a new building.

C、The military officer briefing subordinates.

D、The church worker outlining plans for a fund drive.

A、The insurance manager promoting an insurance package.

B、The politician advocating a new policy.

C、The professor encouraging a student at a lab.

D、The scientist presenting a paper at a conference.

Write an introduction to an informative speech on the topic of bike-sharing business such as Ofo and Mobike. Refer to the “Sentence Patterns”for opening a presentation in 3-1. Make sure your introduction includes the following elements（假如你要作一篇有关共享单车的演讲，请为演讲写一段开场白，必须包括以下几个要素，请参照3-1章节“Sentence Patterns”文件中所提供的句型）： Getting audience’s attention (Attention-grabber) Introducing yourself (Credibility statement) Stating the purpose of your presentation （Objective tatement） Relating the topic to the audience (Relevance to the audience) Outlining the structure of your presentation (Overview of main points) Stating how you want to deal with questions (Q&A plan) A sample introduction（以下为开场白的例子及功能说明）： (Attention grabber: ) If I could have anybody’s attention? (Greeting:) Good morning, ladies and gentlemen. (Credibility statement:) I am Martin Smith, the associate professor of Civil & Environmental Engineering, (Objective statement:) and I’m here today to share with you something about my Ph.D. project at the Department of Civil and Environmental Engineering at the University of Science City. (Overview:)The title of my talk is “Environmental Mitigation in Transportation Projects.” I will start with an introduction to the project, then explain the experimental techniques, next present the most important results, and finally I hope to draw a few conclusions and I also want to acknowledge a few people. (Relevance to audience:) I hope today’s topic is of particular interest to those of you who are exploring the multifaceted considerations surrounding environmental engineering problems on local and global levels. (Q&A plan:) If you have any questions, I'll be happy to answer them as we go along. （Useful expressions for the topic: bike-sharing business共享单车，a form of urban transportation城市交通的一种方式，solution to traffic jam解决交通拥堵的方法，attract attention and funding吸引关注和投资，parking stations停车站，public bike rental service公共自行车租赁服务，QR code二维码，GPS positioning卫星定位，smart lock智能锁，station-free 无需停车桩的，sharing economy共享经济 ）

A.Questions of opinion, fact, and policy

B.Questions of opinion, attitude and value

C.Questions of fact, value and policy

D.Questions of problem, cause and solution

A、Don’t overestimate what the audience knows

B、Relate the subject directly to the audience

C、Don’t be too technical

D、Don’t be too concrete