题目内容

牙周病的局部促进因素，除外

A. 牙石
B. 牙列拥挤
C. 创伤性力
D. 糖尿病
E. 不良修复体

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The younger generation's attraction to stereos cannot be explained only ______ familiarity with technology.

A. in quest of
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C. in terms of
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Witnesses who ______ in a courtroom must swear to tell the troth when they speak for or against the person being tried.

A. modify
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It is a ______ not worthy of such heated argument.

A. trifle
B. trivial
C. pride
D. understanding