单项选择题

He’s not our （）son—we adopted him when he was three.

A. primitive
B. natural
C. first
D. original

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单项选择题
For years now, oil reserves were at ______ levels because of increasing industrial demands.
A. depressed
B. immersed
C. oppressed
D. cursed
单项选择题
The（）on this apartment expires in a year’s time.

A. treaty
B. lease
C. engagement
D. subsidy
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