五、阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。选项中有两项为多余选项。〔人与社会——历史、社会与文化(传统文化)〕
When you use a knife and fork, you have to take the knife with your right hand and the fork with your left hand, or you can't put food into your mouth. But with chopsticks, you can solve the eating problems with just one hand. 1.
Chopsticks were called *zhu* or *jia* in ancient China. It is said that they were invented by Da Yu, who successfully controlled the heavy flood. One day he was busy dealing with the flood. In order to save time when eating, he used two sticks from a tree to take the hot food. That was how chopsticks came into use. 2.
In fact, the earliest chopsticks found in China were made of bronze(青铜), which were unearthed from Yinxu in Anyang City, Henan Province.
Many people haven't probably realized the cultural meaning of chopsticks. 3. Do you notice that one end of chopsticks is square and that the other end is round? So, why? According to our ancestors, the round end symbolized(象征)the sky and the square end symbolized the earth. 4. In Chinese culture, it shows the perfect combination(结合)of *yin* and *yang*.
The influence of Chinese culture has stretched(延伸)far and wide. 5. So it's unbelievable that foreigners cannot use chopsticks.

1~5. BCEAF