单选题
The difference between the control group and the experimental group was______.
A、
the training that parents received
B、
the age of the children
C、
the books that were read
D、
the number of the children
【正确答案】
A
【答案解析】
细节题。第二段提到“In the experimental group，the parents were given a two-hour training session...”，在实验组，父母接受了两个小时的培训，而控制组的父母并没有接受此培训。
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