话题如下：
In some countries the average weight of people is increasing and their levels of health and fitness are decreasing. What do you think are the causes of these problems and what measures could be taken to solve them?
在一些国家，人们的平均体重在增加，健康水平却在下降。你认为这些问题的原因是什么，可以采取什么措施来解决?
高分范文如下：
As some people in poor countries are vastly underweight as a result of poverty, others elsewhere in the world are suffering from another problem-obesity, as a consequence of improved living conditions. A recent study has shown the latter problem is becoming an epidemic, as the number of obese people keeps rising alarmingly. I believe there are several factors responsible for this increase.
The first reason is the poor diet. Nowadays people face fierce competition and suffer from great pressure and they have to devote more time and energy to their careers. Consequently fast food has been gaining its popularity at an amazing rate. Although fast food is time-saving, it lacks nutritive value. Medical researches reveal that eating too much fast food will result in excessive intake of calories, salt and sugar, which leads to overweight.
It is not only a question of what people eat, but also a matter of lifestyles. TV and the Internet have produced sedentary lifestyle. People who watch TV passively or use computers for hours every day simply do not get enough physical exercises. Besides, a growing number of people have come to rely on private cars, rather than walking or using bicycles. Lack of activity gradually contributes to overweight.
In view of the seriousness of the problem, effective measures must be taken before things get worse. In the first place, a proper diet consisting of more vegetables and fruit and fewer fatty foods may assist. In the second place, it is of great importance that people participate in different sports including running, walking, and cycling.
重难点词汇学习：
epidemic
释义
n.流行病; 迅速的传播、生长或发展; 风尚等的流行;
the containment of the epidemic
对流行病的控制
the outbreak of a flu epidemic
流感的爆发
They estimated that between 17,000 and 20,000 cows would die before the epidemic had run its course.
他们估计在流行病结束之前会有17,000到20,000头牛死去。
competition
释义
n.竞争; 比赛; 竞争者; [生]生存竞争;
The competition attracted over 500 contestants representing 8 different countries.
这次比赛吸引了代表8个不同国家的500多名参赛者。
The winners of the competition will be announced next month.
竞赛的获胜者将于下月公布。
An independent regulator will be appointed to ensure fair competition.
将会指定一个独立的管理机构来保证公平竞争。
time-saving
释义
adj.节省时间的;
Sometimes it is convenient and time saving to keep a catalogue of relevent ads at hand.
有时候如果手头有本相关广告目录的话,就会很方便,很节省时间.
A great first step and time saving tool for anyone who frequently does organizational sport scheduling.
伟大的步,节省时间的工具,任何人谁不经常运动的组织调度.
Tabbed Browsing is a modern and time saving feature.
制表符浏览方式具备时尚型,并且节约时间.
passively
释义
adv.被动地，顺从地;
In no case will they look on passively.
他们决不会在一边看热闹.
They were at first grudgingly and later passively accepted.
他们起先是不情愿地,后来是消极地接受了.
People do not merely passively respond to the world.
人们不只是被动地对外部世界做出反应.
consisting
释义
v.由…组成( consist的现在分词 ); 包括; 存在于; 表现为（常与 in 连用）;
Mars has an insubstantial atmosphere, consisting almost entirely of carbon dioxide.
火星的大气层极其稀薄，几乎全部由二氧化碳构成。
David Fincher paints from a palette consisting almost exclusively of grey and mud brown.
戴维·芬彻几乎只用灰色和土褐色作画。
A couple consisting of only two vectors is called a simple couple.
仅由两个矢量组成的力偶叫作简单力偶.
