问题 单项选择题

与大气压力的产生关系最密切的是

A.基托面积

B.牙槽嵴高度

C.边缘封闭

D.后堤区宽度

E.粘膜厚度

答案

参考答案:C

解析:全口义齿只有达到边缘封闭,才能利用大气压力在基托与粘膜之间形成负压。

单项选择题
阅读理解

Chinese and Western eating habits are different. In China, the dishes are placed on the table and everybody shares. It is always polite to let guests or elderly people at the table taste every dish first. But in the West, everyone has his or her own plate of food.

Although there are no strict rules on how to set chopsticks and spoons, there are some things you should never do during a Chinese banquet (筵席).

 Firstly and most importantly, don’t put your chopsticks upright in the rice bowl. Instead, lay them on your dish. The reason for this is that when people die, family members give them a bowl full of rice with a pair of chopsticks sticking out upright in it. So if you stick your chopsticks in the rice bowl, it appears that you want someone at the table to die.

Make sure the spout(容器嘴) of the teapot is not facing anyone, as this is impolite. The spout should always be directed to where nobody is sitting, usually just outward from the table.

Don’t tap on your bowl with your chopsticks. Beggars tap on their bowls, so this is not polite. Also, when the food is coming too slow in a restaurant, you should not tap on your bowl. If you are in someone’s home, it is like insulting the cook.

小题1:What is the difference between Chinese and Western eating habits according to Paragraph 1?

A.In China people are very polite, while in the West people are not so.

B.In China people share the dishes, while in the West people eat separately.

C.In China people use the chopsticks, while in the West people use the knife and fork.

D.None of the above.小题2:What is the main idea of the third paragraph?

A.The reason why chopsticks shouldn’t be put upright in the rice bowl.

B.The Chinese use chopsticks to eat.

C.The Chinese eating habits.

D.How to use chopsticks.小题3:Which of the following statements is TRUE according to the passage?

A.It is polite to taste the dishes before the guests or the elderly.

B.You can put your chopsticks wherever you want.

C.Never tap on your bowls with the chopsticks during the meal.

D.Teenagers can stick their chopsticks in the rice bowl.小题4:The underlined word “insulting” in the last paragraph probably means “_________”.

A.playing jokes on

B.laughing at

C.treating badly

D.looking down upon