You take the elevator when you need to go up a few floors, you get on the little motorized walk ramp at the airport, and you park as close to the front door as possible.  

At first glance, choosing these little convenient modes of transportation doesn't appear to make much of a difference in your daily life. The fact is, they do. A flight of stairs burns, on average, 15 calories. 

If you're taking stairs at work, the mall or in your home on an average day, that could add up to 225 or more extra calories burned. Walk a bit further to get to the front door when you're shopping and you could burn an extra 30. Forgoing the automatic walkway in the airport -- an extra 100! When given the opportunity, use your body, not the elevator or the car. That's what it's made for. 

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1.If you go to work 3miles away from your home，how can you keep fit？

A By bus.

B Drive a car.

C Walk.

D Ride a motorbike.

解析：选C。C 主旨理解题。根据文章内容可知应该多锻炼身体，只要有机会就要运动，到离家3公里的地方上班并不远，步行是最佳选择，故选C。

2.Which is convenient to go up a 20-floor building？

A On foot.

B Walk.

C Run.

D By elevator.

解析：选D。D 生活常识题。对于20层高的建筑来说步行跑步显然是不方便的，只有搭乘电梯似乎科学的，故选D。

3.How many calories will you burn if you go up two flights of stairs？

A 15 calories.

B 30 calories.

C 100 calories.

D 25 calories.

解析：选B。B 细节理解题。根据第2段最后一句A flight of stairs burns, on average, 15 calories.可知a flight燃烧15卡路里，那么two flights自然是30卡路里了，故选B。

4.What is the best way to burn calories？

A Sleeping.

B Smoking.

C Drinking whiskey.

D Running.

解析：选D。D 生活常识题。从ABCD四个选项中，ABC选项分别为睡觉、抽烟、喝酒，显然不是健身选择，而跑步自然是燃烧卡路里的最佳选择，故选D。

5.What is the author's attitude according to the passage？

A People should not drive to work.

B People should not go home by elevator.

C People should get on the little motorized walk ramp at the airport if given opportunity.

D People should use their bodies if given opportunity.

解析：选D。D 态度观点题。根据文章可知作者并没有表示排斥开车坐电梯等便捷方式，因此ABC选项错误，D选项意思为只要有机会就应该好好利用来锻炼身体，故选D。