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单选

What is true of sweet potatoes in Africa?

  • A.The white ones had high levels of vitamin A.
  • B.The commonly-grown ones are low in vitamin A.
  • C.The yellow ones can make you strong and clear your skin.
  • D.The orange ones cannot help overcome the lack of vitamin A.
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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