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  3. What was tested in this experiment? The children who were selected for the experiment gained more IQ points than the others bec

What was tested in this experiment? The children who were selected for the experiment gained more IQ points than the others bec

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问题 What was tested in this experiment?
The children who were selected for the experiment gained more IQ points than the others because they were ______.
选项 A、more clever
B、taught by different teachers
C、taught with new materials and methods
D、given more encouragement by their teachers
答案D
解析 根据文中“Teachers…had given them more positive reinforcement．”(教师给了他们更多的正面帮助。) positive reinforcement中包含了很多正面因素如表扬、褒奖、鼓励等。所以根据文义，选[D]正确。
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