Robots seem very new to most people. But they have a 1 history. A Greek scientist made the first robot. You may 2 robots in some movies. The robots in the movies are usually stronger, faster and 3 than people. In real life, most robots are used in factories. They can do lots of dangerous, difficult or4 jobs. Some people can't look 5 themselves and robots can help them. For example, some people can't see, and they use a guide dog to help themselves move. But now scientists are making a 6 to help them.

    Robots are also used in American hospitals. At one hospital, a robot 7 meals from the kitchen to the sick people's rooms. It never loses its 8 because it has a map of the hospital in its computer system(系统). 9 the future, robots will even work in space. But robots will 10 take the place of(代替)people but only work for people. They can, however, help us in a lot of different ways.

    People like dolphins because they are both lovely and clever. They have an 1 IQ (智商).

Dolphins can 'talk'. Scientists try to ‘talk' with dolphins, and the results make them 2. They find that dolphins 3 understand them so well.

4 animals enjoy playing, but dolphins like to make their games different. On a beautiful day in 1997, scientists on a beach 5 a little dog going into the sea. They were surprised to see the dolphins come up to the dog and then start throwing(扔) it into the air. The dog 6 the 'game' and kept playing with the dolphins for over an hour.

    Dolphins live in a very different world from 7, but they are very good at our 'IQ tests(测试)'. For example, in the picture above, a dolphin jumps 8 the water when he hears a whistle noise(哨声). He does this because he will get a fish 9 an award.

    There is 10 much to learn about these lovely friends.

    The universe is really mystical(神秘的）.Scientists have done lots of study about it but there is still much they haven't discovered.

    Scientists think that there1life on the earth for hundreds of millions of years. However, we have not found life on any other planets2.

    There are eight planets going around the sun. The earth is one of them. There are humans, animals, and many other kinds of life on the earth. There is water and air, too. And compared to other planets, the earth is not too3or too cold. None of seven other planets has an environment like that of the earth.

    The sun and its planets are called the solar system, and our solar system is a small part of a4larger group of stars and planets, called the Galaxy or the Milky Way. There are5stars in the Galaxy, and our sun is only one of them.

    Scientists have also discovered many other galaxy in the universe. They are very far away and their light has to travel for many years to reach us. So 6is the universe? It is impossible to imagine.

    Scientists have sent spaceships to the planet Mars to7photos. They have even sent spaceships to travel outside 8 .However, no spaceship has traveled9to reach other stars in our Galaxy.

    When we see stars twinkling(闪耀）in the sky at night, we may think a lot:10so many stars in the universe, are we alone, or is there life out there in space? Have there been visitors to the earth from other planets? Why has no one communicated with us? We do not know the answer...

    The weather is not the same in many places. In some places it is always 1^, but in other places it is always wet. If the weather is too dry, the land (土地) is not2 for animals or plants. In wet weather there is too much3 and the water in rivers could 4crops (庄稼) away. So people won't have lots of5 to eat. In some other places the weather is very 6. There is always lots of snow. When it snows, all things look 7 

    In winter, days are short and 8 are long. On cold winter nights, when there are no clouds 9 winds, the moon and the stars are very beautiful. People go out to see them. When they 10to their houses, they are always happy to have hot coffee and nice cakes by the fire (炉火).

    The lion is one of the most fierce (凶猛的) animals in the world. Lions can be1 in Africa and India. Lions in Africa can live without water for about one month. Lions are also popular animals in the2 . Almost every zoo around the world has a few lions. It is very3 for people to tell male and female lions from each other. You can judge (判断) simply by their appearance. A male lion has mane while female lions do not have. Male lions are 4than female lions. A male lion usually weighs about 200 kilograms which is always heavier than a female lion. Both male and female lions have very 5 teeth. They can break the backs of other animals 6 Lions feed on other animals and one lion usually kills between ten and twenty large animals each year for 7it's unusual for lions to kill people. However, in 1898 two lions 8and ate over one hundred people in Kenya before they were shot by a British man named Patterson. This 9 became the subject(主题) of a 1996 Hollywood movie called The Ghost and the Darkness. Now the Indian lions are endangered. It's really necessary for us to 10 the animals, or we won't see them again. Animals are our friends. It is our obligation to protect them.