51. Why did America's traditional school year have a three-month summer vacation?
A) Students needed to help with farm work.
B) Students needed time to learn necessary farming skills.
C) The agricultural society then attached less importance to academics.
D) America lagged behind other countries in making a scientific school calendar.
（本题出自2023年6月四级真题卷二）
答案&解析：
51.A)
【精析】细节辨认题。定位句指出，传统的学年，每年夏天有三个月的假期，最初是在美国还是农业社会时实施的，夏季的几个月需要从事农场工作，故答案为A)。
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