There are many kinds of trees. All trees have roots. The roots hold trees in the ground. The roots soak up ( 吸收 ) water and food. Then trees get water and food from the roots. You can't see inside a tree. But you can study how water moves through trees.

    First, get a stalk ( 茎 ) of celery ( 芹菜 ) and cut off its end. Put red colour in a cup of water. Then put the stalk of the celery into the red water. Then we can see the red water moving up in the celery easily.

    After half an hour, take the celery out. Cut it in half. Your celery should be red. This is because the water moved up the stalk. Water moves through trees in the same way as it moved through the celery.

It is easy for many people to catch a cold in the springtime or fall. It makes us wonder if scientists can send a man to the moon, why can't they find a cure for the common cold? The answer is easy. There are actually different cold viruses out there. You never know which one you will get, so there isn't a cure for each one.

When a virus attacks your body, your body works hard to get rid of it Blood rushes to your nose and causes a block in it. You feel terrible because you can't breathe well, but your body is actually eating the virus. Your temperature goes up and you get a fever, but the heat of your body is killing the virus. You also have a runny nose to stop the virus from getting into your cells. You may feel very uncomfortable, but actually your wonderful body is doing everything it can to kill the cold.

Different people do different things to deal with colds. In the United States and some other countries, for example, people might have chicken soup to help them get over the cold. Some people take hot baths. Other people take medicine to stop different symptoms(症状)of colds.

There is one interesting thing to note一some scientists say taking medicine when you have a cold is actually bad for you. The virus stays in you longer because your body doesn't have a way to fight it and kill it Bodies can do an amazing job on their own. There is a joke, however, on taking medicine when you have a cold. It goes like this:

It takes about one week to get over a cold if you don't take medicine, but it takes only seven days to get over a cold if you take medicine.

    Do you go to school every day by bike or in your parents' car? The American English teacher Margaret tells her story about taking a school bus in America.

    When I'm a primary school student, I love taking the school bus. It is interesting to talk to my friends and play games on the bus. It is like children-only party every morning and afternoon. On the school bus there is only one adult（成年人）—the driver. Most of the time, we are well-behaved because we like the driver and don't want to make him unhappy. But one day, one of the boys makes a face at a policeman driving behind our bus. The policeman makes our bus driver stop. Then he scolds（训斥）the naughty boy loudly. We all behave well after that!

    It isn't comfortable for young people to wait for the school bus in winter（冬天） because it is very cold, especially when there are strong winds（风）. Some students in cities have bus shelters（遮挡）, but country children have to jump（跳）up and down to warm up. Hurry up, spring!

    Many students think that learning a new language is very difficult. But if your brain (大脑) is only the same size as a bird's, you will know how difficult it is to learn English. That is what some birds can do.

Many birds can copy (模仿) the sounds of language. A type of African parrot is very good at doing this. This kind of parrot has grey feathers and people say they are clever.

Every December in London, the National Cage and Aviary Bird Show tries to find the best "talking" bird in the world. One bird named Prudle stood out (突出) among the " talking birds"  by winning this prize every year from 1965 to 1977. In 1958, somebody took Prudle from his nest in Uganda, and then sold it to a woman named Iris Frost. She then took care of him at her home in Seaford, England. Before he died in 1994, aged 35, Prudle knew almost 800 words in English. Prudle was also the oldest bird in the world that lived in a cage.

Another parrot named Puck was tested in 1993. It turned out that Puck knew even more words than Prudle. Puck knew more than 1,700 English words. In the 2003 Guinness Book of World Records, Puck was listed as knowing more words than any other bird in the world.

A little bear is called Herry. He doesn't like brushing1. Every day his mother2to him,

"Herry, it's time for you to brush your teeth and go to bed.""I know, Mom." says Herry unhappily. He goes to the3and turns on the tap(龙头). He keeps water running. His mother thinks he is brushing his teeth.

"Too many teeth! How can I brush all these teeth?" Herry feels sad. "Maybe I can do it tomorrow morning. It is too bad to brush teeth every day." He looks at his4teeth and thinks, "I don't want to brush my teeth today. I can brush them twice tomorrow. That will be OK."

But the next day, he doesn't brush his teeth. He always thinks he can do it tomorrow. One morning, when he gets up, he finds all of his teeth have gone5. He cries, "My teeth! My teeth! " His mother comes into his bedroom and says, "What's6?" "I don't have any teeth now, Mom! I7to brush my teeth every day. " He cries again and again. His mother takes him to see the8. The doctor says, "Oh, little bear! I am9to say you can't eat any food now. There aren't any teeth in your mouth."

The little bear cries and cries10. Suddenly he wakes up, "Oh, thank goodness! It is a dream. A terrible dream." He gets up at once and goes to brush his teeth. He tells himself to brush his teeth every day.

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