Red squirrels used to be a common sight in British forests and countryside. But there are fewer than 140,000 red squirrels left now and most of them are in Scotland. However, grey squirrels (introduced from North America) are now so common that many people dislike them. They can be legally（合法的）trapped and destroyed.

   On first sight, the two types of squirrel are similar. They both have a long tail, which helps the squirrel to balance when jumping from tree to tree, and the same large eyes, small ears and powerful back legs. However, the grey squirrel has a clear physical advantage over the red. The red squirrel has a head-and-body length of 19 to 23 centimeters, a tail length of 15 to 20 centimeters and a body weight of 250 to 340 grams. Compared to this, the grey squirrel is a larger animal. The head and body measures between 23 and 30 centimeters long and the tail is between 19 and 25 centimeters long. Adult grey squirrels are heavier, weighing between 400 and 600 grams. This size allows them to store more fat and helps them to survive a hard winter, which would be fatal（致命的）to their  smaller cousins .

So why are red squirrels losing out in competition with grey squirrels? Size is one factor, but there are others. Red squirrels live high up in trees, while grey squirrels spend more of their time on the ground. This means any loss of forests greatly influences the red squirrel population. Another reason for the grey squirrel's success is its ability to use food provided by people. Like the fox, the grey squirrel can survive in towns and cities. The other problem for the red squirrel is disease. Both squirrels carry a certain virus. While this doesn't seem to attack grey squirrels, it is fatal to red squirrels.

     With the change of different seasons, people will need different kinds of clothes. When school begins in autumn, it is cool. So at this time of year, people often wear something such as shirts, coats and pants. Winter usually comes in December. It is very cold in the last two months. And people should wear warm and heavy clothes. Jackets, sweaters, hats, and gloves can also keep people away from the cold weather. Spring is usually from March to May. In spring, the weather changes again and gets nice and warm. People begin to wear cool clothes. With the summer months coming, people often wear shorts, T-shirts or something else to keep cool. It gets very hot in July and August. Don't forget sunglasses and sunshades(遮阳伞), for they are both what you need in the hot sunny season. 

    Some people like to work alone while others enjoy teamwork. In my opinion, everyone had better learn to work with others together because teamwork is definitely necessary and important in modern society.

    First, working in a team provides a chance for us to communicate with each other. Just as the saying goes, “many hands make light job.” Working in a team, teammates share their ideas with each other, which is helpful to create a better achievement. Second, working in a team is a way to broaden our horizon(眼界). Teammates in a team can learn something from each other because they are from different places, owning various experiences and hold different views towards things. Therefore, getting along with other teammates is also a process of increasing our knowledge. Third, working in a team is also a way to establish(建立) our friendship. Teammates in a team have chances to help each other, to solve the problems together, to share the happiness of being successful, which make a great contribution（贡献） to establishing friendship.

    So working in a team is one of the most effective（有效的） ways to extend（扩展） our personal relationships. To sum up, to learn to work in a team is really necessary and important and we should try to enjoy it.

    Have you ever been so worried about something that you have a headache or even can't sleep at night? Then you cannot pay enough attention during a test or to your study．If so, then you know that is stress．You are worried too much about something．The bad feelingin your mind can make you angry, sad, or scared, and can even give you a stomachache or a headache．

    However, some kind of stress is good． Excitement might happen when you are called to give a speech at school．You feel nervous but excited．This kind of stress can help you to get things well done．And you may do a better job in your test if the stress pushes you to prepare more beforehand．

    On the other hand, bad stress can last long if you are unable to come over your problems．You may not feel well, if your parents are having a quarrel, if a family member is badly ill, if you're doing poorly at school, or if anything else makes you unhappy．That kind of stress isn't going to help you．And it can actually let you do worse in your daily life．

    The best way to fight the stress is to have a balanced life．Make sure you get enough sleep and eat properly．Have some regular exercise．You should spend some time for fun．Get advice from your parents, teachers and friends．Soon after that, you'll probably get away with your stress．