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16.A balanced diet is essential for teenagers.

分析 平衡膳食对于青少年是必要的.

解答 balanced,根据句子成分可知使用形容词修饰名词diet,由首字母可知应使用balanced"平衡的",故答案为balanced.

点评 对于根据首字母填空这种题,要分析句子意思,再从结构上和意义上对答案进行确定.

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