- Flies (苍蝇) usually live in the dirty places.Let’s look at a fly, and see where it 27 . First, it flies out of the w...
- Students learn their lessons in class.In class teachers teach them.Students sit in the classroom listening to the t...
- Many animals use some kinds of language .They use signals (信号) and the signals have meaning , For example, When a b...
- As everyone knows, there are many 16 of transportation in the world, like bicycles, buses, ships, trains and 17 ....
- Many people think that water will never be used up(用尽)because there are many rivers and lakes. And the rain can m...
- We have always been interested in the moon. 2000 years ago people already knew it moved around the earth and where it...
- Taking away a city’s rubbish is a big job. Every day trucks come into a city to collect it. Most rubbish is made up o...
- When you speak, write a letter or make a telephone call, your words carry a message. People communicate (交流) with w...
- In most parts of the world, many students help their schools make less pollution. They join “environment clubs”. In a...
- When we talk about the climate(气候)of the UK, you may think of f 1 London and rainy weather. Actually, after many ...
- Is your schoolbag too heavy? The e-schoolbag will help you. It is said that e-schoolbags are going to be brought into...
- What is the best way to study? This is a very important question. Some Chinese students often 31 very hard for long h...
- More than 50,000,000 people live in the rainforests of the world and most of them do not hurt the forest they live in...
- How did I become known as a "rubbish picker '? I never 36 rubbish before. I didn't care where it went or who cleaned ...
- How many plastic bags do you use every day?46 there any chance for us to live without them? What can we do to have47 ...