对话文本
A: why are there still so many people overweight despite the current fitness craze?
C: well, there are certain factors that effect people's size and weight.
A: what are they?
C: one study said that low-income groups have a higher percentage of over-weight people than higher income families.
A: why?
C: the survey said that the low, income groups eat more junk food on a daily basis.
A: that makes sense. Probably less time to make dinner and the junk food is cheaper.
C: and junk food contains lots of fat and oil. There is one final reason why so many people are fat.
A: what's that?
C: nobody exercises anymore-not even kids! The average american home has the TV on for 6 hours a day!
A: wow! No wonder people are so fat. Say, Carl, looks like you could be doing a bit more exercising.
C: yeah, I guess so.
A: you should consider eating healthier food and getting some more exercise.
C: hey, I started a diet and lost 10 pounds.
A: so what happened?
C: well, I quit and gained it back plus 5 pounds.
A: you should have kept trying.

参考文本
现在健身这么火,为什么还是有那么多人超重呢?
嗯,还是有一些因素会影响人们的体型和体重的.
都有哪些因素呢?
有研究表明低收入人群超重的比例比高收入人群高.
为什么呢?
说低收入人群每天吃太多的垃圾食品.
可以理解,他们每天工作忙,没时间做饭,垃圾食品又比较便宜.
垃圾食品油脂含量又高.不过还有另外一个原因.
什么?
现在很少有人锻炼身体,甚至小孩都不锻炼.家里电视一天至少开6个小时.
天啊.怪不得人们变得这么胖.卡尔,你是不是也该锻炼锻炼身体了?
可能吧.
你可要注意饮食了,多做锻炼啊.
我节食一段时间,瘦了10磅呢.
后来呢?
我放弃了,结果体重反弹,又胖了5磅.
贵在坚持啊.

核心词汇

Overweight: (of people 人) too heavy and fat 太胖的；超重的
She was only a few pounds overweight.
她只是超重几磅而已。

Fitness: the state of being physically healthy and strong 健壮;健康
a magazine on health and fitness
卫生与健康杂志
a fitness instructor/class/test
健美教练／班；健康合格检查
a high level of physical fitness
高水平体质

Quit: to stop doing sth 停止;戒掉
I've quit smoking.
我戒了烟。
Just quit it!
你就罢手吧！
We only just started. We're not going to quit now.
我们才刚刚开始，现在决不放弃。

核心词组
make sense
1.to have a meaning that you can easily understand 有道理；有意义；讲得通
This sentence doesn't make sense.
这个句子不通。
2.to be a sensible thing to do 是明智的；合乎情理
It makes sense to buy the most up-to-date version.
买最新的版本是明智的。
3.to be easy to understand or explain 表述清楚；易于理解；道理明显
John wasn't making much sense on the phone.
约翰在电话上说得不大清楚。
Who would send me all these flowers? It makes no sense.
谁会给我送这么多花呢？真不可思议。

No wonder: 难怪
No wonder you can't sleep when you eat so much.
你吃这么多难怪睡不着。

On a daily basis:按每天的标准;每天