(单选题)

What can you do when you are running on a treadmill to have a similar energy cost as run outdoors? ( )

A.Use the treadmill in a hotter room.

B.Use the treadmill more frequently.

C.Set the treadmill to a proper incline.

D.Set the treadmill to a higher speed.

参考答案：C

参考解析：

根据题干关键词energy定位至第一个小标题的内容，What they found is that runners could adequately compensate for the extra effort of running outdoors by setting the treadmill to a 1% gradient. 研究人员发现，跑步者可以通过将跑步机的坡度设置为1%来充分补偿户外跑步所付出的额外努力。ABD三项均不符题意，故本题正确答案选C。

知识点：细节题英语阅读理解通用英语