2. 外语
  3. The classes Aof steroids differ Bby one another Conly in the additional atoms attached Dto their central structure.

The classes Aof steroids differ Bby one another Conly in the additional atoms attached Dto their central structure.

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问题 The classes Aof steroids differ Bby one another Conly in the additional atoms attached Dto their central structure.
选项 A、 
B、 
C、 
D、 
答案B
解析 By is the incorrect preposition after differ in this sentence. Correction: from.
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托福（TOEFL）

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