2. 外语
  3. In America, ______ is compulsory and free.

In America, ______ is compulsory and free.

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问题 In America, ______ is compulsory and free.
选项 A、the higher education and elementary education
B、the elementary education and vocational education
C、the secondary education and higher education
D、the elementary education and secondary education
答案D
解析 美国初等和中等教育共12年，从6岁到18岁．是属于免费义务教育阶段。
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