Which of the following can be inferred from the passage? The difference between the control group and the experimental group wa

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问题 Which of the following can be inferred from the passage?
The difference between the control group and the experimental group was ______.

选项 A、the training that parents received
B、the age of the children
C、the books that were read
D、the number of the children

答案A

解析 本题考查的是考生对细节的把握。答案在第二段;In the experimental group, the parents were given a two-hour training session. “在进行实验的这一组里,给家长进行两小时的培训。”文章的调查研究中把孩子及其家长分成两组,显然区别在于实验组里的家长接受了培训。
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