(单选题)

What could be learned from the research?

A.A workout after break fast improves gene performances.

B.Too much workout often slows metabolic rates.

C.Lifestyle is not as important as morning exercise.

D.Physical exercise before breakfast is better for health.

参考答案：D

参考解析：

推理判断题。根据最后一段“The implication of these results is that to gain the greatest health benefits from exercise, it may be wise to skip eating first.”可知，这些结果暗示，为了从运动中获得最大的健康益处，先不吃东西可能更明智。因此推断早饭前的体育锻炼对健康更有益。故选D。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语