单项选择题

According to the passage, heroes are compared to high- voltage transformers in that ______.

A．they have a vision from the mountaintop
B．they have warm feelings and emotions
C．they can serve as concrete examples of noble principles
D．they can make people feel stronger and more confident

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单项选择题

The author concludes that historical changes would ______.

A．be delayed without leaders with inspiring personal qualities.
B．not happen without heroes making the necessary sacrifices.
C．take place if there were heroes to lead the people.
D．produce leaders with attractive personalities.

单项选择题

Madonna and Michael Jackson are not considered heroes because ______.

A．they are popular only among certain groups of people.
B．their performances do not improve their fans morally.
C．their primary concern is their own financial interests.
D．they are not clear about the principles they should follow.