The substance reacts______as fast as the other one.

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问题 The substance reacts______as fast as the other one.

选项 A、ten
B、tenth
C、a tenth
D、one-tenth

答案D

解析 one—tenth as fast as“速度相当于……的十分之一”,这是以分数形式出现的倍数表达法之一。
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