You might say that Barack Obama was elected President of the US because he knows how to give a good speech. In 2004, the little-known Obama gave a speech at the Democratic national Convention(民主党全国会议). It was a great speech---poetic, and inspiring. The people who heard it would remember it for a long time.
Since 2004, Obama has written and delivered thousands of speeches. These are usually praised for two reasons: he treats the audiences like intelligent adults, and he is able to express difficult ideas in a straightforward, natural way.
Before becoming President, Obama was a lawyer, a college professor, and a successful writer---his two memoirs have become best-sellers. The skills he needed to succeed in his previous jobs have also contributed to his success as a speechmaker.
As a lawyer, Obama learned how to make strong, convincing arguments. As a professor, he learned how to explain complex subjects in ways that helped students understand without boring them. As a writer, he learned how to use language to have a powerful influence on his audience.
Secret weapons of Obama 
Writing team: Obama has a team of people who write his speeches. The writers chat with Obama for hours about what he wants to say. They listen to recordings of past presidential addresses and seek advice from advisers. Obama usually edits and rewrites the drafts several times.
Make fun of the guests: Obama starts his speech by gently making fun of his guests. His opening lines attract the audiences’ attention while giving them an opportunity to relax and laugh at themselves and each other.
Making fun of himself: Obama laughs at his past mistakes and is never afraid of showing them to the public.
Obama delivers speeches to audiences large and small. He can make his audiences laugh or cry. His speeches are always thoughtful, well written, and just right for each occasion.
.. The third and fourth paragraphs mainly talk about _____.

A．why Obama’s speeches are praised

B．how Obama acquired his speaking ability

C．what subjects Obama’s speeches about

D．Obama’s success as a writer and a lawyer

. When delivering a speech, Obama ______.

A．usually starts with some famous sayings	B．sometimes turns his speech into a song
C．sometimes shares a joke with the audience	D．is very strict most of the time

. What is the main idea of the passage?

A．Obama won the election campaign.	B．Obama is a brilliant speechmaker
C．Obama had taken a couple of jobs.	D．Obama is good at writing.