Many people believe that yellowing and wetness are the greatest enemy of stamps. In fact, stamps are afraid of not only wetness, but also light and dirty things. People protect their stamps in several different ways.

 To protect stamps,we should never touch the stamps with our hands.This avoids moving dirty things onto them. Stamp tweezers (镊子) should be used in all conditions.

 Stamps are printed things. The colour will slowly disappear if the stamps are put in the light for a long time. So we should not put stamps in the light for long. Direct sunlight must be avoided as well.

 Wetness is an important  problem for stamps. Some  collectors  will put stamps  in separate plastic (塑料) bags. However, it is possible that some stamps have taken in some water from the air before they are put into the plastic bags.Stamps yellow easily and rapidly after they take in wet air.To protect the stamps, some people also put the stamps into a special room which has a machine to  keep the air cool and dry. However, not many people can afford that.

 To keep stamps, stamp collectors usually put them under plastic covers. It is a common and simple way. This helps because the plastic cover keeps the stamps off the wet air. It also stops the fingersfrom touching te stamps.

 Some  collectors  prefer  to  store  stamps  inside  a  plastic  box  with  desiccants  (干燥剂).However, we should take care not to let the stamps. touch the desiccants. On top of that, don't  take your stamps out on a wet day.

{#blank#}5{#/blank#} Which is the best title for the passage?

    Would you like to eat a root? You probably already have. People and animals eat many kinds of roots. ①Most roots that people eat are usually called root vegetables. A root vegetable is what we call veggies that grow underground.

    A carrot   is one type of root vegetable. It is the orange, edible root of the carrot plant. ②to, many, in, like, people, salad, put, it(.) A turnip , is another root vegetable. It is a member of the cabbage family. Turnips are usually eaten boiled, steamed, roasted, fried, pickled, or even raw.

    ③Although some people do not consider potatoes to be a veggie, but they are a root vegetable.

    People like to eat them mashed, boiled, and fried. Sweet potatoes, yams, beets, and leeks are some other root vegetables that people like to eat.

    There is half a glass of water on the table. Is the glass half empty or half full? This question can represent a situation where there is both opportunity(机会) and trouble, but people with different point of views see the same situation in different ways. Ask yourself this question and see what kind of person you are.

    If your answer is "half empty", it shows that you tend to look on the dark side of things. You are a negative-thinking person. You are worried about what you don't have or what you have lost more than what you already or still have. In other words, you are a pessimist(悲观主义者).

    If you see the glass as half full, you tend to look on the bright side of things. You are a positive-thinking person. You know you should take the opportunity that comes your way rather than worry about getting into trouble. This is to say, you are an optimist.

    We don't live in a perfect world, but if we can change the way we see things, the things we see will change.

    To be healthy and happy is important for each of us. Do you want to improve(改善)your health and feel better? Here are some ways.

    Eat whole foods. Eat some healthy foods, such as fruits, vegetables, nuts and a little meat. If you have a healthy eating habit, you'll be happier.

    Exercise. Take up a sport you really like. If you want to keep healthy, try to exercise for 30 minutes a day, twice or three times a week．

    Get enough sleep. It is best to get eight hours' sleep a day. A cup of milk before sleeping may help you get a good sleep.

    Keep yourself busy. This is good because it stops you from having bad habits. To keep yourself busy, you can walk around the house, spend time with your pets, do a sport, or do a hobby you enjoy.

    Spend time with your friends. Spend time and have fun with them. Talk with them, but you shouldn't talk about anything bad. You should stay with the people who are healthy and happy.