(单选题，1分) At first, Tom found it difficult to ___ what his teachers said in class.A. punishB. recognizeC. purchaseD. absorb

本题考查对不同词汇含义的理解和运用。解题的关键在于分析每个选项单词的意思，然后结合句子的语境，判断哪个单词能使句子表达通顺合理。

• A选项“punish”：其含义是“惩罚；处罚”。若将“punish”代入句子“At first, Tom found it difficult to punish what his teachers said in class.”，句子表达的是汤姆一开始觉得很难惩罚老师在课堂上说的话，这在逻辑上是不合理的，所以A选项不符合题意。
• B选项“recognize”：意思是“认出；识别；承认”。把“recognize”放进句子“At first, Tom found it difficult to recognize what his teachers said in class.”，句子意思是汤姆一开始觉得很难识别老师在课堂上说的话，“识别”这个动作通常针对具体的事物或人，对于老师说的话用“识别”不太能准确表达句子想要传达的意思，所以B选项不合适。
• C选项“purchase”：意为“购买”。当把“purchase”代入句子“At first, Tom found it difficult to purchase what his teachers said in class.”时，句子变成汤姆一开始觉得很难购买老师在课堂上说的话，这显然不符合逻辑，所以C选项不正确。
• D选项“absorb”：有“吸收；理解；掌握”的意思。将“absorb”代入句子“At first, Tom found it difficult to absorb what his teachers said in class.”，句子表达的是汤姆一开始觉得很难理解老师在课堂上说的话，这符合正常的语境和逻辑，所以D选项是正确的。