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.
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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.
单项选择题
A．It is hard for her to get the kids to sleep.B．The neighbor’s son produces noises with his car.C．She has a sleep disorder.D．She doesn’t quite get used to the new environment.
A．It is hard for her to get the kids to sleep.
B．The neighbor’s son produces noises with his car.
C．She has a sleep disorder.
D．She doesn’t quite get used to the new environment.
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