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.

A. When you're with friends on bikes, it's much safer to ride behind, not next to each other. Where one road meets another, you should take even more care. Slow down and check both roads.

B. If you have an accident or fall off your bike, a helmet will protect your head. It must be the right size.

C. Many children have accidents when they listen to the music while riding. It's important to hear everyone else on the road.

D. Before you even set out, it is important to ensure that your bike is roadworthy（适于行驶的）and safe. Do all the parts work properly?Is there enough air in your tyres（轮胎）?

E. Cycling at night can be really dangerous. Go slower than you would in the daytime.

F. Red traffic lights aren't only for cars and buses. They're for you too if you're on a bike.

    Stanford is a world famous university on the west coast of the US. {#blank#}1{#/blank#}, because the poor boy died of a strange disease.

    Tourists are often surprised at the beauty of Stanford. Among the green trees, buildings with yellow walls and red tops make up a beautiful picture. {#blank#}2{#/blank#}. That's because they were the favorites of Mrs. Stanford.

    {#blank#}3{#/blank#}. It stands at the center. It was built by Mrs. Stanford to remember her husband who devoted himself to the university. There, students and teachers can communicate with God, and they can also hold great activities, such as concerts and celebrations.

    {#blank#}4{#/blank#}. It is the landmark of the university. A man named Hoover had done a lot for the university. The things he once used can be seen on the first floor. On the top of the tower, tourists can have a good look at the whole campus.

    As one of the world top universities, Stanford has many subjects that stand among the top ones in the world. {#blank#}5{#/blank#}. If you want to study computer in a university abroad, maybe it is your best choice.

    Good manners mean good actions in social communication. ⑴A person who has good manners is welcome because he always thinks of others. A person with good manners won't say anything that will hurt others. A person with good manners won't influence people when they are talking.

    Then how can we learn to have good manners? ⑵In fact, that is not difficult at all. Good manners just mean respect (尊重) for other people.

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