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

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The volcano that raised the islands are still （）in places.

A.inactive
B.enormous
C.energetic
D.lively

单项选择题

Mary was not in her bedroom yesterday afternoon.She（）in her classroom.

A.should have been
B.must have been
C.must be
D.should be