一起答
单选

What is the passage mainly about?

  • A.The different functions of vitamin A.
  • B.The introduction of nutritious crops to Africa.
  • C.The history of growing potatoes in Africa.
  • D.The most popular food in Africa.
试题出自试卷《2012年10月全国自主考试综合英语(一)真题及答案》
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