How do animals communicate (交流) with each other? They have special “languages”. In fact, they are using signals (信号). Different signals have different meanings.

    For example, when a bee (蜜蜂) finds food somewhere, it flies home quickly. It can't speak, but it can tell others by dancing. Other bees will know where and how far the food is.

    Some animals show their feelings by making sounds. For example, when a dog is angry, it barks (吠). At this time, you'd better stay away from it. Birds can make several sounds to show different meanings. Sometimes we humans show feelings by making sounds instead of by speaking. For example, when we feel painful (疼痛的), we cry“Oh!”or“Ouch!”.

    We humans have languages and words. We can communicate face to face by speaking. We can write down what happened in order to remember clearly. We can also send (寄) messages to people far away. But animals can't.

根据短文内容，判断正误。

It's not WASTE until it is WASTED

    With the World Environment Day coming, our school is now requiring every student to form a habit of sorting the waste.

    Here in our schoolyard we lay four different colors of rubbish bins for different kinds of rubbish. The red is for harmful waste; the blue is for waste that can be recycled(循环再用); the green is for kitchen waste; the yellow is for other waste.

    The following are some instructions for you

    Glass: Empty bottles without caps can be recycled to make new glass bottles.

    Warning: Mirrors and light bulbs(电灯泡) must not be included in the glass waste.

    Paper: Newspapers, magazines, boxes must be clean enough to be recycled.

    Warning: Paper tissues (餐纸) and wall paper are not recyclable as paper and should be kept separately.

    PMD waste: Packaging made of Plastic or Metal and Drink boxes are used to make new packaging.

    Warning: Plastic pots(e. g yoghurt pots ), plastic bags must not be included with the PMD waste.

    Harmful waste: out-of-date drugs, used batteries(电池)， paint and oil…

    Besides, if you don't need your old bikes at all, our school volunteers will collect them. We're going to fix them up and then give them away to kids who don't have enough money for a bike.

    To find out more about recycling, you can visit our school website.

    Do stars only appear at night? The answer is no .Venus （金星） is the one and only star that can be seen in the daytime. It shone at its brightest in the night sky on February 17^th, 2017.

    Venus is the second planet from the sun in our solar system. It is the second brightest natural object, behind Earth's moon, in the night sky. Why is it so bright?

    First of all, Venus is the closest planet to Earth. It is also covered by highly reflective （反射的）clouds, which can reflect about 70 percent of the sunlight striking（照射） it, almost twice as much as Earth does.

    Some called 2017 the year of Venus, because the planet is at its brightest when it goes further away from the sun, and nearer to Earth. The brightest moment happened once in February, and happened again, during daylight, on April 30^th.

    If Venus is so bright and close to us, isn't it a better choice for human exploration than Mars? It is closer to Earth than Mars and it's closer to Earth in size. The closer distance to the sun means solar power would be easier to generate （产生） as well.

    However, with a temperature of about 465℃on the surface, Venus is the hottest planet in our solar system!

    But scientists never give up. Recently, a team of NASA and Russian scientists created new computer equipment that can stand the temperature of 480℃. It can work under Venus-like conditions for almost 22 days.

    The next step, according to the scientists, is to send a probe（探测器）to Venus by 2025.

No matter what you want to do with your life, you'll need an education first. You make your own future. You want to be a doctor, a teacher, or a police officer? A good education is required for every single one of those careers (职业). And what you're learning in school today will decide whether your country can meet the greatest challenge in the future. 

The truth is, being successful is hard. Some of the most successful people in the world are the ones who've had the most failures. For example, the first book of J.K. Rowling, the writer of Harry Potter, was refused 12 times before it was finally published (出版). Michael Jordan was once kicked off his high school basketball team. He lost hundreds of games and thousands of shots during his career. But he said, "I have ailed over and over again in my life. But that's why I succeed." These people succeeded because they understood that the failures were the mother of their success. So if you get a bad grade, that doesn't mean you're stupid. In fact, you need to spend more time studying. 

I expect you to put your best effort into everything you do. So don't let us down, don't let your family or country down. Most importantly, don't let yourself down.