单项选择题

The local government has begun a （）in this city to cut down the traffic accidents.

A.protest
B.punishment
C.protection
D.project

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单项选择题

（）the physiological system will reset itself，but it does take time.

A.In time
B.On time
C.By the time
D.At the time

单项选择题

（）of language refers to the property of language in having the structure of two levels.

A.Arbitrariness
B.Genetic-cultural transmission
C.Non-arbitrariness
D.Duality