In ancient times, Chinese ancestors liked to steam or boil food. It was difficult for them to use spoons to get vegetables in the soup. So they (clever)invented chopsticks to pick up food. Development of chopstick has experienced a long history. Chopsticks only became two sticks of the same (long) in the Shang Dynasty(16th- 11th century BC).
As chopsticks feature the coming of civilization to food culture, the invention also (have) many scientific theories:The lever(杠杆)principle of mechanics is applied into practice . The point two sticks crossed is the pivot(支点)of the lever . An interesting experiment shows that many joints and muscles are being exercised you use it. They certainly make you cleverer, (do)they?
Chopsticks are small but they (admire)by many people in the world. Nowadays, chopsticks serve many new functions besides tableware. For example, you can buy a pair as a gift to your friends and rela- tives. In Chinese, it reads kuaizi, (mean)to have sons soon, so a newly-married couple will be very happy to accept it as their wedding gift. Skillful artists paint beautiful scenery on chopsticks (make)them like fine artworks. Many people love to collect them too. Many foreigners are interested in puzzled about how to use it. They need to practice a lot.
