People usually check whether their keys, purses and phones are with them before going out, but many people in China now have one more important thing to take--a mask(口罩). They hope it can protect them 1 terrible air.

    Many cities in China saw a lot of foggy days in April. In Beijing, there were eight days in April full of smog. It is dirty air 2 looks like a mixture of fog and smoke. The smoke is mainly from cars and factories in cities. Poor air is bad for people's health, 3 for children and old people. They fell ill easily and the 4 were full of people. They had problems with their noses and lungs.

    So it's necessary 5 people from doing so many bad things to the environment. For example, people should use cars less and   6 burn lots of coal and gas. Government needs to take measures to make factories stop pouring 7 waste air into the sky.

    Three students from No. 4 High School in Beijing 8 a report to advise how to protect the environment. They suggested  9people should plant more trees and act off fewer fireworks for celebration. We hope more people will join us in 10 a difference. In this way, the blue sky will certainly return for good.

    In the universe, as we all know, there is the sun, the moon, the earth and a good many stars. Through our geography lessons, we know the earth goes around the sun, and the moon goes around the earth. We have day and night because the earth keeps turning all the time. When our part of the earth turns to the sun, it is day. When our part of the earth turns away from the sun, it is night.

    Just because the moon is closer to the earth than the sun, it looks much bigger than the sun. Big things will look smaller when they are further, and small things also look bigger when they are nearer.

    The sun is big enough to give out very strong light. The moon can't give any light at all, but it looks quite bright, too. Why? In fact, the light from the moon comes from the sun. The moon looks much bigger and brighter than the stars. But actually (事实上) the stars are much bigger and brighter than the moon. They look smaller than the moon also because they are further away from the earth.

    There are many other planets in the universe. But of all the planets, only on the earth there are living things and people can only live on the earth, too. But at 9:00 a.m. on October 15th，2003, Chinese pilot Yang Liwei was sent up to space. He stayed there for 21 hours. It was the first time for Chinese to get into space.

    A "talking kitchen" teaches students how to cook French and speak French. Researchers at Newcastle University in the United Kingdom have developed the French Digital(数字的) Kitchen. Professor Paul Seedhouse led the project.

    "It works like a satellite navigation(导航) system in a car. The system can tell whether you've done what you were asked to do or not. For example, the sensor(传感器) in the knife not only knows that the knife is moving, but it also knows how the knife is moving. So it can discover whether the knife is slicing (切), whether it's scraping (刮) or what. And so it doesn't go on to the next stage of the program unless you've done what it senses(感到)you should have done," said Paul Seedhouse.

    Students can ask the computer to repeat the instructions or translate them into English. There are vocabulary(词汇) lessons before and after the cooking.

    Professor Seedhouse became interested in the idea after he visited a talking kitchen designed for a different purpose. In his opinion the French Digital Kitchen turns the process (过程) of learning language into a real life experience. "Here you're taking it out of the classroom and you're actually using the language to produce something which you can eat at the end of it. It's very enjoyable," he said.

    The system will be available for sale by the end of 2020. Adding the technology to a new kitchen could add about ten to twenty percent to the building costs. The system could also be added to an existing(现存的) kitchen.

    The researchers are also developing a new digital(的呼吸法) kitchen system that is easy to carry or to move. And the European Union has given them money to begin programs in six other languages, including English, Italian and Spanish.

    We usually think that plants always stay quiet and never speak. Grass doesn't cry when you cut it; flowers don't shout when they're picked. But this view of the world couldn't be more wrong. Plants talk to each other all the time. Their language is one of chemicals.

    Over the years, scientists have found that different types of plants, from trees to tomatoes, send compounds(复合物)into the air to help neighboring plants. But exactly how plants receive and act on many of these signals is still a mystery.

    Scientists from Kyoto University in Japan looked at tomato plants that had been bitten by insects. To start out, they grew plants in two plastic bags connected by a tube(管子). One plant had been bitten by insects. The other was not bitten.

    They found that when insects bite plant leaves, the plants don't sit quietly. They send a chemical called "hexvic" into the air. Humans can't notice it, but these chemicals carry a smell that neighboring plants can notice. This way, neighboring plants realize the danger and begin to give off more "hexvic" to protect themselves.

    The same scientists continued their research by placing insects on the plants that had not been bitten. The plants were able to kill nearly 50 percent of the invaders, much more than their neighbor.

    It was surprising that the plants that had not been bitten didn't send the chemical until the received a warning message from their infested(受侵的)neighbor, the scientists said. These findings could be used to help farmers with the control of the insects which do harm to their plants.

Shanghai is a very large city. How do so many people go to work or school? Now, let's know 1 about its transport(交通).

In Shanghai you can travel around the city by underground, by bus, by taxi and by car. The underground 2 the city at different points and goes to all parts of the city. Travelling by underground is 3 way to get around the city. The 4 way to travel around the city is by bus. It's a slow way to travel. You can also travel around the city by taxi. It is 5 than taking a underground or a bus, but the taxi will take you to the very place you want to go to. 6 the taxi will be slow if the traffic is heavy. The last way to get around Shanghai is using 7 own car. However, it's not easy 8 you to drive, especially when you are driving in the rush hour( 高峰期). If there is 9 accident on the road, you will have to wait for a long time.

The best time 10 around the city is from 9:00 a.m. to 4:00 p.m.. Traffic will be less crowded because most people are already at school or at work.