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 hobby is something you enjoy doing when you're free.     ①     . Western people like to try exciting new things. They like to go on adventures（冒险）and often do something physically  challenging（体力挑战）.     ②     . They usually do something like handwriting or painting for fun.

Hobbies can bring us great joy as well as a lot of knowledge.     ③     . Making things can develop our imagination（想象力）and creation （创造力）. Sports can help us stay healthy. Hobbies are fun.     ④     . Sometimes we have to spend a lot of time studying

for our hobbies. But I think that if you really enjoy doing something, you should never give up. And then you will have a lot of fun with your hobby.

    Hello, I'm Lin Tao. This is my school. It's a big and beautiful school. There is a big play ground. The gym is next to the playground. In front of the gym, there are science labs. Behind the gym, there is a library. So we can see the gym is between the science labs and the library. In the library, there are many books. Look! This is our teaching building, and there are 48 classrooms in it. In my class, there are 56 students.34 of them are boys, the rest are girls. On the right of the teaching building, there is a dining hall, and we often have lunch there. Teachers' offices are in front of our teaching building.

    Scientists are trying to turn deserts into usable land again. {#blank#}1{#/blank#}, so people can live and grow food. They are learning a lot about deserts. {#blank#}2{#/blank#}. Scientists may not be able to change these deserts. People are doing bad things to our planet.

    Some places don't get much rain. {#blank#}3{#/blank#}. This is because green plants are growing there. Small green plants and grass are very helpful for dry places. Plants don't let the hot sun make the soil too dry. {#blank#}4{#/blank#}. When a little bit of rain falls, the plants hold the water. {#blank#}5{#/blank#}, land can turn to desert much more easily.