单选题 The number of deaths from heart diseases will be reduced greatly if people ＿＿＿＿＿＿＿＿＿＿＿ to eat more fruit and vegetables. 的答案

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题目内容：
The number of deaths from heart diseases will be reduced greatly if people ＿＿＿＿＿＿＿＿＿＿＿ to eat more fruit and vegetables.
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