Every year, millions of birds are killed or hurt when they fly into buildings. Why does this happen?     1     Birds are flying into windows and tall buildings that are all covered by glass.

Many birds fly from one place to another. Most of the time, they live in the wild, such as forests and wetlands.     2     They might see small trees and flowers inside a window and want to rest on these plants. The birds do not know there is glass between them and the plants.     3    

Some birds fly at night. They use the moon and stars to help guide them in the right direction. Tall buildings with lights on at night can confuse (迷惑) the birds.     4     The birds see the light, but they cannot tell that the light is coming from inside a building. They fly toward the light and crash into a building. On many mornings, there might be several dead birds lying on the ground.

    5     Many office buildings now turn off their lights at night. This helps reduce the number of birds that fly into buildings and it also helps save energy.

【推荐3】Cartoons are very popular around the world, especially for young children. Here are the five most popular cartoon dogs among children. Do you know something about them?

Many people believe that, by the year 2100, we will live on the planet — Mars (火星). Here is what life could be like.

First of all, transport should be much better. By 2100, spaceships can travel at half the speed of light.     1    

Secondly, humans need food, water and air to live. Scientists should be able to find plants that can grow on Mars. These plants will provide us with food and air.

    2     We could easily jump too high and fly slowly away into space. To prevent this, humans on Mars have to wear special shoes to make themselves heavier.

Life on Mars will be better in many ways.     3     It is possible to live in a large building with many bedrooms. Then, robots will do most of the work, so we can have more time for hobbies.

    4     Every student can study, do their homework on the computer and take exams in online schools. Each student will also have their own online teacher called “e-teacher”.

However, in some ways, life on Mars may not be better than that on the earth today.     5     Meals will probably be in the shape of pills (药片) and will not be as delicious as they are today. Also space travel will make many people feel ill.

【推荐2】Today, bottled water is becoming an important part of people’s life.     1     Why do people get used to drinking bottled water? Because it is quite convenient (方便的).

At the same time you may find that bottled water isn’t cheap.     2     So, why is bottled water so expensive?

One reason is that you spend money on the water. Sometimes, it’s the same as what comes out of the faucet (水龙头). For the most bottled water, however, it comes from natural springs (泉水) in far-away places.

    3     Then, it’s bottled, packaged (包装), and shipped to stores all over the world.

The costs don’t end there because you also need to spend money on the bottle.     4     What’s more, in order to make more people know and like their bottled water, companies (公司) spend millions advertising (做广告) their bottled water.

So, if you don’t want to spend much money on bottled water, you can bottle your own water from home.     5    

【推荐3】Today there are more fires than in the past . Over 100,000 wildfires burn each year in America . Russia has 20,000 to 35,000 wildfires and Australia has about 60,000 each year. These fires destroy（损害）huge areas of forests and burn hundreds of homes .

Many experts believe there are several reasons for this sudden increase in fires. The first reason is climate（气候）change . In 2010, Russia had the hottest and driest summer with strong winds in a century. In just one month, 500 fires destroyed over 2,000 homes. Some people lost their lives .

Traditional fire-fighting practices are another reason for the increase in fires. In America, firefighters used to quickly put out every fire as quickly as they could. They didn’t allow the grass and trees to burn. As a result , today many forests have thicker vegetation（植被）which provides more fuel（燃料）for fires . So surprisingly, America has many more fires today partly because of its past fire-fighting practices.

Scientists now understand that a fire can be a natural part of a healthy forest. As a result, countries like Australia allow some fires to burn naturally. The fire makes old trees thinner. This allows sunlight to reach the ground. As a result, fires help new trees to grow. Therefore , if a fire is not a serious threat（威胁）to people , firefighters may let it burn naturally .

【推荐1】Air pollution is one of the most serious problems for people nowadays. But some people in the US say that they have found a way to solve the problem. In many cities, hundreds of people ride bikes instead of taking a bus or driving a car to work every day.

In New York, some bike riders even make a group. Its name is “Bike for a Better City”. They say if more people ride bikes to work, there will be fewer cars and less air pollution. They want to solve the problem of air pollution. They want to build roads for bikes only because it’s not safe for bike riders to use the same roads with car drivers. Members of “Bike for a Better City” think that if there are bike roads, more people will ride bikes to work. They are working hard for this idea.

But there aren’t any bike roads now. In the city, not everyone thinks it is a good idea to build bike roads because it costs much money and time. And car drivers don’t like the idea, either. Because many people live too far away from their working places, they can’t go to work by bike.

【推荐2】Many facts show that children are too heavy and this is getting worse, according to the doctors. I feel there are a lot of reasons for this.

Some people think there are too many shops selling unhealthy, fatty foods, such as fried chicken and ice-cream, more and more parents are too lazy to cook at home. If there were fewer of these restaurants, then probably children would buy less take-away food.

Other people think parents allow (允许) their children to become too heavy. I agree with this, because good eating habits begin early in life. They agree their children to eat what they like. They always go for sweet and salty foods.

There is a third reason for this. Children these days take very little exercise. They do not walk to school. When they get home, they sit in front of the television or their computers and play computer games. This is an unhealthy pastime, and it also gives them time to eat more unhealthy food. What they need is to go outside and play active games or sports.

The above are the main reasons for this problem, so we have to advise (建议) young people to take more exercise.

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