单选题 The author does not directly state, but implies that

A、 participation in interesting activities relating to a subject improves one's achievement in that area.
B、 too many children are lazy and have poor work habits.
C、 school principals do more than their share in interpreting the curriculum to the parents.
D、 teachers should occasionally make home visits to parents.

【正确答案】 A

【答案解析】[注释] 推理判断题。本题问：本文作者暗示了什么?第4段第2句写道：“可以劝说家长让学生参与讨论家庭预算、购买食品、在家中使用码尺或量杯、开钟、计算旅行中每英里的耗油量并从事其他需要数学知识的计数活动。”上述活动可以提高孩子对数学的兴趣和成绩。以此为例来暗示[A]参与与某一课程有关的有趣活动可以提高学生该课程的成绩。”