单项选择题

The passage tells us that some manufacturers, instead of changing their product, would prefer to change its _________.

A．production cost
B．quality
C．market value
D．appeal
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单项选择题
The advertising man is said to share with the Church, the Bar, and Medicine, the ability to _________.
A．convince people of the truth
B．win people's confidence
C．accept people's prejudices
D．exploit people's fears
单项选择题
When the writer says leadership has become the universal vitamin C pill, he means _________.
A．leadership can cure many diseases as vitamin C does.
B．leadership is an essential part of everybody.
C．leadership can prevent one from failure.
D．leadership brings power, respect, achievement, etc.
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