—That's why Premier Li Keqiang asks operators（运营商）to provide     Internet.

    The bamboo is nature's most surprising plant. Many people call this plant a tree, but it is a kind of grass.

    Like other kinds of grass, a bamboo plant may be cut very low to the ground, but it will grow back very quickly. A Japanese scientist reported one bamboo plant which grew about 1.5 metres in 24 hours! The bamboo grows almost everywhere in the world. There are more than 1, 000 kinds of bamboo in the world.

    Not all bamboo looks the same. Some bamboo plants are very thin. They may only grow to be a few centimetres wide while others may grow to be more than 30 centimetres wide. This plant also has different colours.

    Bamboo has been used to make many things such as hats and kitchen tools. Because it is strong, bamboo is also used to build buildings.

    Many Asian countries have used bamboo for hundreds of years. They often use bamboo for buildings and supporting new buildings and bridges while they are being built.

    In Africa, poor farmers are taught how to find water by using bamboo. These African countries need cheap ways to find water because they have no money. Bamboo pipes（管子）help poor farmers bring water to their thirsty fields without spending a lot of money.

—No. In fact, I don't know the meanings of the words.

— Yes, we shouldn't talk loudly in public.

— For the trail-walkers. After they finish the tough hike, they need to      lots of water.

    Can trees talk? Yes, but not in words. Scientists have reasons to believe that trees do communicate with each other. Not long ago, researchers learned some surprising things. Some caterpillars(毛毛虫) attacked a willow tree(柳树) in the woods. The tree changed the chemistry of its leaves and the leaves tasted so terrible that the caterpillars stopped eating them. Then even more surprising, the tree sent out a special vapour (蒸气) a signal causing its neighbours to change the chemistry of their own leaves and make them less tasty.

    Communication, of course, doesn't need to be always in words. We can talk to each other by smiling, raising our shoulders and moving our hands. We know that birds and other animals use a whole vocabulary of songs, sounds and movements. Bees dance their signals, flying in certain patterns that tell other bees where to find nectar(花蜜) for honey. So why shouldn't trees have ways of sending messages?

— They are discussing what to do to help animals.