单项选择题

Diamonds have little（）value and their price depends almost entirely on their scarcity.

A. extinct
B. permanent
C. surplus
D. intrinsic

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单项选择题

For many people, overeating and overspending are as（）to Christmas as candles and holly.

A. integral
B. suitable
C. inevitable
D. compatible

单项选择题

Differences in positions adopted by oxygen and hydrogen atoms account for variations in the crystalline structure of different forms of ice（）

A. are caused by
B. explain
C. derive from
D. constitute

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