We use chopsticks every day. Chopsticks are a pair of small sticks. They are used for eating. ___1___  

(1) When chopsticks were invented?

Before chopsticks, Chinese people ate with their hands. But how did they eat soup or porridge? ___2___ Chinese started to use chopsticks about 3,000 years ago.

(2) How to use Chinese chopsticks?

 ___3___ You then pick up food by pinching (夹紧) the sticks together. It may be hard at first. ___4___  

(3) Chopsticks Etiquette (礼节)

Chopsticks are often held in the right hand. When you eat with elders, let them take up chopsticks first. ___5___

Chopsticks are not just tools. They are also a part of the culture.

A. To use chopsticks, you hold two sticks in one hand.

B. Here are some things to know about chopsticks.

C. They had to use sticks to eat them.

D. However, there are many stories about chopsticks.

E. But it becomes easier with practice. 

F. It’s polite to pick up food for elders and children.

1.1.

A

B

C

D

解析：选B。B 根据后面的小标题“When chopsticks were invented?”“How to use Chinese chopsticks?”和“Chopsticks Etiquette”可知，此处填入句子引出后面对筷子的介绍，选项B“以下是关于筷子的一些知识”，最符合上下文文意。故选B。

2.2.

A

B

C

D

解析：选C。C 根据前面一句“But how did they eat soup and porridge?”可知，这里回答没有筷子前人们怎么进食汤和粥。选项C“他们不得不用棍子来吃它们”最符合上下文文意。故选C。

3.3.

A

B

C

D

解析：选A。A 根据该段小标题“How to use Chinese chopsticks?”可知，该段主要讲了怎么使用筷子，因此填入的句子和筷子的使用相关。选项A“使用筷子时，一只手拿两根筷子”最符合上下文文意。故选A。

4.4.

A

B

C

D

解析：选E。E 根据前面一句“It may be hard at first.”可知，该句对使用筷子一开始很难作进一步说明。选项E“但通过练习，它会变得更容易”最符合上下文文意。故选E。

5.5.

A

B

C

D

解析：选F。 F 根据该段小标题“Chopsticks Etiquette”可知，填入的句子与使用筷子的礼仪相关。选项F“主动为老人和孩子夹食物是有礼貌的表现”最符合上下文文意。故选F。