单项选择题

According to Nigel, most problems of air travel are caused by （）.

A．unfavorable weather conditions.
B．airports’ handling capacity.
C．inadequate ticketing service.
D．overbooking.

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单项选择题
（） refers to the study of the internal structure of words and the rules of word formation.

A．Phonology
B．Morphology
C．Semantics
D．Sociolinguistics
单项选择题
The Declaration of Independence was written by （）.

A．Thomas Jefferson.
B．George Washington.
C．Alexander Hamilton.
D．James Madison.
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