The Milu deer is a kind of animal with large horns(角). They were very common in China long ago. They lived together and ate grass and the soft parts of trees. In the past, people did not protect the Milu deer and killed them for food or sport, so they disappeared(消失) from China .

      Luckily before all of them disappeared, the Duke of Bedford(贝德福特公爵) took some to Britain. The Milu deer like the cool, wet weather in England and their numbers increased(增长) year by year. As a result, when in1985, the government of China wanted to bring back the Milu deer, the Duck of Bedford was able to help. The first deer came back to China to the Nanhaizi Milu park near Beijing and to Dafeng, Jiangsu Province.

      Since they returned to China, their number has grown quickly .There are now so many of them that a new park has been opened for them in Hubei Province. Now the Milu deer live in the wildlife parks and have good protection. We hope that one day they can live in the wild again.

    Parents often believe that they have a good relationship with their teenagers. But last summer, Joanna Henry noticed a change in their older son: suddenly he seemed to be talking far more to his friends than to his parents. “The door of his room is always closed,” Joanna noted.

    Tina and Mark noticed similar changes in their 14-year-old daughter. “She used to cuddle up (蜷伏) with me on the sofa and talk,” said Mark. “Now we joke that she does this only when she wants something. Sometimes she wants to be treated like a little girl and sometimes like a young lady. The problem is to find out which time is which.”

Before age 11, children like to tell their parents what's on their minds. “In fact, parents are first on the list,” said Michael Riera, writer of Uncommon Sense for Parents with Teenagers. “This completely changes during the teen years.” Riera explained. “They talk to their friends first, then maybe their teachers，and their parents last.”

Parents who know what's going on in their teenagers' lives are in the best position to help them. To break down the wall of silence, parents should create chances to understand what their children want to say, and try to find ways to talk and write to them. And they must give their children a mental (精神的) break, for children also need freedom, though young. Another thing parents should remember is that to be a friend, not a manager(管理者), with their children is a better way to know them.

    Since ancient times, human beings have looked up at the night sky. Comets (彗星) and meteors (流星) flying through the blackness were seen as signs from the gods. They were used to tell the future of human lives.

    In 2013, a meteorite shower hit an area in Russia. It injured around 1,200 people. In ancient times, this would have been a strange and terrible experience. Today, thought, science offers simple explanations for the occurrence (事件).

    Meteorites are small pieces of debris (碎片) that float around in space. Sometimes, they come near a planet, such as Earth. When they enter our atmosphere, they often heat up and become very bright. This is why they are sometimes called “fireballs”. They are usually made of metals, such as iron (铁), and other minerals (矿物). The Russian meteorites were stony, with iron making up 10 percent of them.

    Meteorite showers, such as that in Russia, happen when a large meteor enters the Earth's atmosphere and, due to heat, breaks up into small parts. Most of these are very small — smaller than a grain of sand — and so don't even make it to the ground. But others can cause a lot of damage.

    The meteor in Russia weighed 10 tons when it entered our atmosphere, and broke up about 20-30 miles (30-50 km) above ground. The sky was filled with bright lights and loud noises. Many windows were broken. The damage cost Russia around 206 million yuan.

    Babies born after 2017 may never need to take a driving lesson because of the development of self ­driving cars. Some scientists say that self ­driving or driverless cars(无人驾驶汽车)may hit the roads within 15 years, and it is possible that driving may become unnecessary, or more relaxing and enjoyable.

    Companies like Google, Baidu, Apple and Alibaba are working on driverless cars. But, if the tests are successful, these electric self­ driving cars could be put into use very soon. This kind of cars may change the way we live in the future. All you have to do is to type in the address!

    According to Baidu, driverless technology has the following four advantages. Firstly, driverless cars are actually safer. With driverless cars, the number of deaths caused by accidents will decrease. Secondly, driverless cars are more efficient(效率高的) than manned cars. Thirdly, driverless cars follow the traffic rules. Therefore traffic control will be easier to achieve. At last, the cost of transportation will be reduced as the labor cost becomes less.

    There are many different technologies needed to make a successful self ­driving car. The most difficult technologies of all are environmental perception(感知), behavior prediction, planning control, HD mapping, and exact GPS.

    My parents often take me to the zoo at weekends. I like animals. I have many toy animals in my room. In the zoo I can see tigers, elephants, pandas and many other animals. Some animals are friendly, but some are not. Tigers, lions and snakes are dangerous. That is why they have to be in the cage. But I think it is terrible for animals to be in the cage.

    Tigers usually live in forests and mountains. They can run. They catch and eat small animals, but now they live in small rooms. They can only walk and sleep in the cages, and they want to go out. I feel sorry for them.

    I think my favourite animals are dolphins. I like watching them swim and jump. They can play with a ball. They can "walk" on the water! They are very friendly to people. They can help you when you fall into water and can't swim.