单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．Cleaning fluids.
B．Bums.
C．Unusual smell.
D．Milk.
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单项选择题
A．The origin of language is a legend handed down from the past.B．The origin of language is a matter that is hidden or secret.C．The origin of language is a question difficult to answer.D．The origin of language is a problem not yet solved.
A．The origin of language is a legend handed down from the past.
B．The origin of language is a matter that is hidden or secret.
C．The origin of language is a question difficult to answer.
D．The origin of language is a problem not yet solved.
填空题
The work done by aircraft mechanics and service technicians and reservation am transportation ticket agents and travel clerks in air transportation are called ______ occupations.
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