(单选题)
Child adoption is mentioned in the passage to show that ______.
A.good will may sometimes complicate racial problems
B.social surroundings are vital to the healthy growth of children
C.intelligence testing also applies to non-academic areas
D.American opinion can shift when it comes to sensitive issues
参考答案：D
参考解析：
概括归纳题。根据文章第六段第一句“intellectual level seems to be a sensitive subject, and what the law allows us to do varies from time to time”可知，作者认为美国人在敏感话题上态度会发生变化，儿童收养问题只是作者举的一个例子，旨在说明在一些敏感问题上，人们的观点可以不断变化的情况。故选D。
知识点：
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