【推荐2】Sports can help us a lot. Taking exercises can make us strong. In collective sports like basketball, volleyball or football, we will learn the importance of cooperation. And sports can also help us relax after work or study.

However, as the saying goes, “there are two sides of everything.” Sometimes we may hurt other players or ourselves if we are not careful enough when participating in sports activities. What’s more, too much or hard practice can be bad for our health.

Sports can make us healthy both physically and psychologically. It is also a good way for people to know each other and can improve friendship between people. So long as we are careful enough, sports can do us nothing but good.

【推荐3】About ten men in every hundred suffer from color blindness in some way. Women are luckier, only about one in two hundred is affected in this matter. Perhaps, after all, it is safer to be driven by a woman!

There are different forms of color blindness. In some cases a man may not be able to see deep red. He may think that red, orange and yellow are all shadows of green. Sometimes a person cannot tell the difference between blue and green. In rare cases an unlucky man may see everything in shades of green -a strange world indeed.

Color blindness in human beings is a strange thing to explain. In a single eye there are millions of very small things called “cones”. These help us to see in a bright light and to tell difference between colors. There are also millions of “rods”, but these are used for seeing when it is near dark. They show us shape but no color.

Some insects have favorite colors. Mosquitoes prefer blue to yellow. A red light will not attract insects, but a blue lamp will. In a similar way human beings also have favorite colors. Yet we are lucky. With the aid of the cones in our eyes we can see many beautiful colors by day, and with the help of the rods we can see shapes at night. One day we may even learn more about the invisible colors around us.

【推荐1】Many people who want to lose weight often choose to go on a diet. But is this really the best way? With celebrities (名人) speaking about new diets that have helped them become slim (苗条的) in advertisements (广告), more and more people are turning to dieting. Some shops begin to sell diet products such as diet milkshakes, snack bars and even diet pills. However, such popular products and diets are often found to be extremely unhealthy.

Most of these popular diets work by cutting down on a certain nutrient (营养素) from your food intake (摄入量). For example, some diets work by cutting down on carbohydrates (碳水化合物). This means the body must use its fat reserves for energy. This might help you lose weight. However, by cutting a particular food group out of your diet, you are starving your body of a nutrient that it needs, which could leave you feeling weak, tired or even bad-tempered. Besides, these diets are often unsuccessful in the long run.

Generally, one of the most effective ways of losing weight is to cut down on calories. The recommended (推荐的) calorie intake for an adult male is 2,500. If a man consumes more than 2, 500 calories each day, then he is likely to gain weight. However, if he consumes less, then he is likely to lose weight.

In fact, proteins, carbohydrates, fats, vitamins and minerals all play an important role in staying healthy, which is why they all should be included in your meals. Of course, some foods can be eaten in moderation (节制) as an occasional snack. For example, a bar of chocolate every once in a while won’t cause you any problems.

So, instead of spending money on popular diet pills or special weight loss foods, try to eat healthy balanced meals containing foods from all food groups. So, next time your friends tell you that they are going on a diet, tell them that eating a healthy balanced diet is a much better choice.

【推荐3】A house is the most expensive thing most people will buy. Very few people have enough money of their own to buy a home, so they have to borrow money from a bank. Borrowing money from a bank to buy a house is called “take a mortgage （抵押）”. The bank usually lends money or gives a mortgage for twenty-five years. Houses are so expensive that many people nowadays have to borrow as much as $ 50 000. In other words, they will have a $ 50 000 mortgage.

How can you get a mortgage？ When you find a house you like, you go to a bank. The bank will research you financial history and decide if they think you are a good risk. They will want to know what kind of job you have, what kind of salary you make, and how long you have had the job. They will also want to know how much money you have. In addition，the banks will require a down payment. Depending on which state you live in， the bank may require as much as 30% of the-price of the house as a down payment. The bank will then lend you the rest of the money to buy the house. Many people are never able to buy a house because they cannot save enough money for the down payment.