There is a zoo in my town. I often go there with my parents by 1 on the weekend. It usually takes my father about 2 minutes to drive there. We often leave home at about eight and 3 there at about twenty past eight.

    I like many kinds of animals, but I like  4 best. First, they are very cute. Second, they are friendly, and they are one of China's 5. but now pandas are in great danger, so we must  6 them.

    Now, I'm watching the two pandas in the zoo. I  7 want to go near and play with them. 8 I also want to give them some food. But 9 the rules in the zoo: 1. Don't go near tothe animals. 2. Don't give10 to the animals.

    To make animals live a happy life, everyone needs to follow the rules.

    A 22-year old British student has invented a mobile fridge that could save millions of lives across the world.

    Will Broadway's "Isobar" has been designed to keep vaccines(疫苗) at the ideal temperature while they are being sent in developing countries. And Will doesn't plan to make money from his creation. His purpose is to get vaccines to people who need them, which is why he won't be trying to get a patent(专利). Will's Isobar has won him the James Dyson Award that challenges young people to "design something that solves a problem".

    Present methods of transporting vaccines can lead to the vaccines freezing(冻住) before reaching their places in developing countries, but the Isobar keeps a temperature of 2 to 8 degrees for 30 days.

    Will's invention is expected to save the lives of 1.5 million people across the world, a number he says is "amazing". Having now finished college education, he is making an effort to take the Isobar into production. "I would be hands-on, all the way through it, knowing that it works," he says. "It's amazing to just give it a go, even in my back yard, and see the potential(潜能) of the technology."

    The product has been designed to transport vaccines, but already Will sees the possibility of other medical uses in the developing world and beyond. "Blood donations, organ transplants(器官移植)- if they get trapped in traffic, you still use cold bags that really aren't good enough for a long time," he says.

    There is also a possible, non-medical use of the Isobar. "It would be a great thing to take on a five-day trip where you have no power," he says. But he insists vaccine transportation is the primary function(功能) of his invention.

    As space science develops, man has learned more and more about space. Space is not only amazing but also dangerous. While working in space, spacemen are facing danger as well as success.

    Scientists have found out that radiation(辐射) is the greatest danger to spacemen in space. When spacemen are working in space, they are in danger of radiation from the sun and other stars, which is bad for their health. The damage(危害) done by radiation won't be discovered until their children or even grandchildren are born. Some special medicine may work a little, but no really helpful medicine has been.

    Space junk is also thought a great danger to spacemen. It's reported that there are 9, 000man﹣made things flying in space. About 30% of these are satellites, 10% are spaceships, and the rest are space junk. An explosion(爆炸) in 1996made a cloud of 300, 000 fragments, each at least 4mm in size, and even a small piece of these knocked against a spaceship window and did some damage. Scientists are watching and reporting any possible danger all the time. They are working on helpful ways to do with space junk.

    Although space is really dangerous, it interests everyone on the earth. In the near future, it may become usual for people to spend a few days in a space hotel. We may even choose to leave the earth and live in space in a few years. So we should care for space and do something to help improve the space environment.

    It's important to learn about protecting our environment. Here is a 5R rule for us:

    Reduce

    If you want to reduce waste, you should use things wisely(明智地). A larger number of trees are cut down to make paper. If everyone uses paper carelessly, soon we will not have any trees left. Other things are also being wasted, and people don't know what to do with the waste in big cities. So it is necessary to use things wisely.

    Reuse

    You should always think of reusing the usable things before throwing them away. For example, you can give your clothes you do not wear any more to the poor. In a family, you may pass on such clothes to younger brothers or sisters.

    Recycle

    Bottles, cans and paper can easily be recycled. By recycling them we save lots of time and money. For example, Coke cans are sent to a factory, where they are smashed flat (压平) and melted(融化) and the metal things are made for new Coke cans.

    Recover(恢复)

    When you buy a box of apples, there may be a few rotten(腐烂的) apples, you have two choices(选择): One is to throw the whole apples away, or you can cut off the rotten parts and keep the good parts. In the way, you are recovering the eatable(能吃的) parts of food.

    Repair

    If one of the legs of your table is broken, you can repair it. If you want to change for better ones, it is better for you to sell the old things or give them to other people who can use them after doing some repair.

    Many people know that rubbish is a big problem on planet Earth. What many people don't know is that junk (垃圾) has become a problem in outer space too.

    According to BBC News, there are more than 22, 000 pieces of space junk floating around the earth. And these are just the things that we can see from the surface of the earth by telescopes (望远镜). There are also millions of smaller pieces of junk that we can't see.

    Objects, like bits of old space rockets or satellites, move around the planet at very high speeds, so fast that even a very small piece can break important satellites or become dangerous to astronauts. If the tiniest piece of junk crashed into a spaceship, it could damage the vehicle.

    To make things worse, when two objects in space crash, they break into many smaller pieces. For example, when a U. S. satellite hit an old Russian rocket in 2009, it broke into more than 2,000 pieces, increasing the amount of space junk.

    To reduce additional space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth's atmosphere after that time. In the upper parts of the atmosphere, it will burn up.

    Many scientists are also suggesting different ways to clean up space junk. In England scientists are testing a metal net that can be fired into space junk. The net catches the junk and then pulls it into the earth's atmosphere to burn up. The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely destroyed.

    "The problem is becoming more challenging because we're sending more objects into space to help people use their mobile phones and computers," says Marco Castronuovo, an Italian space researcher.

    "The time to act is now. The longer we leave the problem, the bigger it will become," he says.