单项选择题

Questions 18～21 are based on the following passage. Today McDonald’s pursues a principle of ______.

A．best service at a fair price
B．equal service without discrimination
C．customer first
D．low price for the best service
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单项选择题
What is said about the over 100 aircraft incidents in the past 15 years
A．They were suspected to have resulted from electromagnetic interference.
B．They may have been caused by the damage to the radio systems.
C．They were proved to have been caused by the passengers’ portable computers.
D．They may have taken place during take-off and landing.
单项选择题
A．excessB．short-cutC．accessD．trick
A．excess
B．short-cut
C．access
D．trick
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