单项选择题

According to the passage, if an airline has an accident-free record, it usually pay ______.

A．no premium
B．less premium
C．a large premium
D．the same premium as the other companies
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单项选择题
The word heyday from the second paragraph can be best expressed by ______.
A．the best time
B．the worst time
C．the beginning
D．the ending
单项选择题
We can infer that the word ambiguous in the last paragraph probably means ______.
A．clear
B．uncertain
C．mysterious
D．satisfying
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