In 1620, about half the USA was covered by forests. Today the forests have almost gone. A lot of goo...
2009-10-02
The English people like take-away food. The most popular food is fish and chips.They usually go to a...
Once Einstein gave a lecture in many places in America. His driver always listened to him and knew t...
The students were having their chemistry(化学)class. Miss Li was telling the children what water was l...