A
Nowadays，many middle school students are overweight. This is not just a problem about looks，but also about health. 1. So，what can the government do to help?
First，the government can make schools do more. 2. For example，they serve more healthy food like fresh fruit and vegetables in school dining halls. Also，schools add more fun sports classes. Students can now try different sports such as dancing or skateboarding.
Second，the government uses ads to tell students about healthy living. 3. These ads are on TV，the internet and even on buses. They show students how good it is to eat well and exercise.
However，some students don’t like these ideas. 4. They think they should be free to decide what to eat and how much to exercise.
In short，the government is trying to help students be healthier. But it’s not an easy job. 5.
A. What’s your idea about it? B. These ads are everywhere.
C. Schools start to make changes. D. They think it’s not their own business.
E. It can cause problems like heart disease.
F. Students don't like being told what to do.

B
Pollution is a “dirty word”. To pollute means making things unfit(不合适的) or unclean to use. 1. ______ We see it，smell it，taste it and drink it. Pollution is beginning to threaten(威胁) our health，our happiness and our life.
Humans have been polluting the earth from the time they first made a fire，washed clothes in the river and threw waste on the ground. 2. At first the problem was not so serious because there was plenty of clean air，land and water. 3. All the dirty things could be absorbed(吸收) by nature and soon be covered over. But this is no longer true. The increase of the population and the development of industry have changed that. Humans are slowly polluting the environment.
Through the use of poison(毒药)，humans have polluted land and killed the animals. By putting dirty water and chemicals into rivers and lakes，we have polluted our drinking water，killing the fish. 4. More people，more waste.
Are we turning the world into a big rubbish dump，or is there any hope that we can get rid of pollution? 5. Many people are working hard to control it.
A. Pollution comes in many ways. B. Humans couldn’t probably live on the earth.
C. Our increasing population is part of the problem.
D. There weren’t so many people then and their wants were fewer.
E. Luckily，millions of people have been warned of the danger of pollution.
F. When land was used up or water became dirty, humans moved to another place.