What’s the passage mainly about?
A. Heroes who have changed the world.
B. Three traits that a true hero possesses.
C. The bettering off of the present world.
D. The power of the people as a whole.
What does the speaker want to prove by using Abraham Lincoln as an example?
A true hero can choose to do the right things.
B. A true hero is always modest and unselfish.
C. A true hero must have a strong will.
D. A true hero tends to treat others equally.
Who is used as an example to show that a true hero can influence a large number of people?
A. Benjamin Franklin.
B. Martin Luther King, Jr.
C. George Washington.
D. Thomas Jefferson.
常见的电容精度有：
A. I级±5%
B. II级±10%
C. III级±20%
D. IV级±30%
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