Tornadoes(龙卷风) are one of the worst weather events on earth. Each year, tornadoes kill many people. The storms often carry homes, cars and trees from one place to another. And they can also destroy anything when they pass by.

      A tornado comes from a thunderstorm(雷雨) in the sky down to the ground. It is big at the top and small at the bottom.

      A tornado appears when winds in different directions meet in the cloud and begin to turn in circles. People can see tornadoes almost everywhere in the world. But most happen from late winter to middle summer. There is a second high season in November. During spring, warm air moves north and mixes with the cold air left from winter. In November, the opposite happens. Cold air moves south and mixes with the warm air left from summer.

      Tornadoes always come suddenly. Weather scientists have done something to predict(预测) tornadoes. But the storms often move too fast for people to protect themselves. Last year, tornadoes killed more than one hundred people in United States.

      Scientists say the best place to be in is a small room, without windows, in the middle the lowest part of a building when tornadoes come.

The population of the Earth is growing faster. It is important that we look after the Earth. We need it!
The Earth gives us a lot of things. We also give the Earth a lot, but some of the things are not good.
In nature, when something dies, other animals and plants get food from it. Every animal or plant gives food for other animals or plants. However, animals can't get food from many of the things that we ‘give' the Earth. Animals and plants can't eat metal, plastic and glass. These things will stay in the ground for many, many years.

Some rubbish is very dangerous for plants and animals. In some places, many animals live together. One animal makes food for many more animals. If we put rubbish and chemicals in the water, the plankton(浮游生物) can die. If there isn't any plankton, many animals have nothing to eat.
So what can we do? Don't leave any rubbish in the countryside! Don't make so much rubbish!

阅读下列短文,从每小题所给的A、B、C、D四个选项中选出一个最佳选项。

    You know how much your telephone has changed over the past 10 years? Your car will change even more than that in the next 10 years.

    One of the biggest changes is that cars will drive themselves. Some day you may not need to drive a car. You will just tell the car where you want to go and it will drive itself.

    Google

    The American company Google has been working on a self-driving automobile for years. These cars are already on the roads in the United States, mainly in California.

    Google cars are truly self-driving. These cars have no steering wheels(方向盘) or pedals(刹车踏板).

    Last week, police ordered one of Google's cars to stop for driving too slowly on a public road. The car was not against any law, so no one was punished. But police did speak to the operators of the vehicle(车辆).

    According to Google, its self-driving cars have been driven nearly 2 million kilometers. That is equal to the distance the average person drives in 90 years.

    So far, no Google self-driving car has gotten a traffic ticket. Some of them have been in accidents when other cars hit them.

    Tesla

    Another American company, Tesla, added an “Autopilot(自动驾驶仪)” feature to its cars last month. Tesla put the feature, a computer software program, in cars that were built after September 2014.

    With the Autopilot turned on, the vehicle drives itself. The car will speed up, slow down, brake and steer by itself.

    You can take over driving any time by turning the steering wheel or touching a pedal. Your car will slow down if the vehicle in front of you gets closer. It will turn at bends and change lanes if you use the turn signal.

    Tesla Autopilot takes over driving at speeds over 29 kilometers per hour when you press a button twice. Autopilot is made for cross-country driving. It keeps you in the lane and helps you avoid hitting other cars.

    Other Self-Driving Cars and Buses

    Other companies such as Mercedes-Benz, Audi, BMW, Volvo and Toyota are working on self-driving cars. Another company called BestMile is also working on self-driving buses in Switzerland. The buses can hold up to nine people and will be tested for two years.

Technology (技术)for space travel made our life on Earth better in many ways.Let's look at things we wouldn't have without space travel.

·Camera phones

In the 1990s NASA (美国国家航空航天局)made cameras small enough to fit on spacecraft.The technology is now used in cell phone cameras so that we can take selfies.

Sports shoes

There wouldn't be Nike Air trainers if we didn't go to space.The shock-absorbing(减震的) materials of the shoes come from space suits.

·Water cleaning system

In the 1960s,NASA created a technology to clean astronauts' drinking water.It is now widely used to clean water in swimming pools.

·Wireless (无线的)headset

Astronauts could easily get tangled up in wires,so NASA made wireless,hands-free headsets.

Astronauts can then move while talking and listening.

·Dust busters (手持吸尘器)

Astronauts hoped to collect samples on the moon.A company created a tool to help them do that.

The company then used this technology to make the dust buster in 1979.

·Computer mouse

In the past,you needed to type in codes(代码)in your computer to make it work for you.In 1968, a NASA researcher tried to make computers on spaceships easier to use,and this led to the creation of the mouse.

"I don't like my parents. They are too strict. They always tell me I should do this, and should not do that. It sometimes makes me angry," said Wang Li, a middle school student in Guangzhou. Do you have the same problem? Why does it seem that some parents are not so friendly in their children's eyes?

 One of the most important reasons is when some one becomes a parent, he or she likes worrying things. They worry about everything about you, from the time you were born. They do a lot for you, though something would make you angry because they care about you and worry about you. They worry about your choice of friends, the food you eat , your work at school, how much sleep you get and so on. All these things are part of your life. They want you to live healthily and happily.

 So how can you make things easier on yourself? It's easier than you think. Make sure your parents know what you' re doing. Get them to know your friends. Phone them if you get home later than usual. Say sorry to them when you make mistakes. Talk about your ideas with them. They may talk about theirs with you. Most of all, try to think about why your parents do this or do that. They are still practicing being parents and need help you can give them.

David is a photography lover from England.He often searches for information about photography exhibitions on the Internet.The following exhibiting information is all he read on some websites.