In ancient times, chopsticks were called " Zhu". At that time, Chinese ancestors【B1】________ (like) to steam or boil food. It wa

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问题     In ancient times, chopsticks were called " Zhu". At that time, Chinese ancestors【B1】________ (like) to steam or boil food. It was difficult for them to use spoons to dip vegetables in the soup. So they【B2】________ (clever) invented " Zhu" to nip food, thus it has become【B3】________most convenient tableware in their lives. The【B4】________ (appear) of chopsticks said goodbye to those days【B5】________our Chinese ancestors had to use their hands to eat, so they featured the coming of civilization to food culture. The invention has many scientific【B6】________ (theory). Chinese people are familiar【B7】________the use of chopsticks. Many foreigners are interested in but also puzzled about how to use it with facility.
    The use of chopsticks has been a part of Chinese food culture. There are some manners that you must pay great attention to, or you may make mistakes and be laughed at. For example, don’t use them to poke at every dish without【B8】________ (know) what you want.
    Nowadays, chopsticks serve many new functions besides tableware. Skillful craftsmen painted beautiful sceneries on chopsticks【B9】________ (make) them like fine artworks. Many people love to collect them as their treasure.
    Chopsticks are small but they【B10】________ (adore) by many people in the world. An interesting experiment shows that many joints and muscles are being exercised when you use it. They certainly make you cleverer, don’t they?
【B6】

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答案theories

解析 考查各词单复数。句意:筷子的发明有很多科学理论。前面有many修饰,后面名词要用复数。故填入theories。
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