下列各个化学变化前后，同种元素的化合价数值变化最大的是（ ） A．C→CO2 B

Smiling

　　People smile at times. ____71______.Depending on different cultures, smiling can express joy and amusement, but it can also indicate embarrassment. The following examples show this point of view:

_____72_____.Every one smiles at each other, this nonverbal communication shows being friendly in the United States. However，in China, smiling is not only an expression of happiness, but also a way to avoid being embarrassed. ____73____. Smiling is a kind of good will but not sneer（嘲笑）. For example: When a child falls off from a bike, the adults in China may smile, which is a kind of gentle encouragement and may not be a kind of impolite laugh.

When a person from the United States might blush（脸红）with embarrassment or become offensive, a Chinese might blush with smile. To avoid serious misunderstanding, people who engage in intercultural communication should be able to understand the meaning of smiling appropriately.____74______ Also; different cultures have different meanings about laugh. For example, Americans can enjoy a very heartfelt belly (腹部) laugh that comes from the deepest emotions. _____75_______.

A．Related to the smile is the laugh.

B．Chinese people like smiling when they are embarrassed in order to avoid embarrassment.

C．Nonverbal communication is important because it is culture-related. It is based on different beliefs, religions, values and customs in different cultures.

D．However, most Chinese seldom laugh that way because they are thought to be silly except among close friends.E. In an attempt to be open and friendly, people in the United States smile a lot.

F. Feelings of friendship exist everywhere but their expression varies.

G. However, the meaning of a smile in different cultures may be different.

在请求分页系统中，LRU算法是指( )。

A．近期被访问次数最少的页被优先淘汰

B．近期最长时间以来没有被访问的页优先淘汰

C．以后再也不用的页被优先淘汰

D．最早进入内存的页被优先淘汰

在焦平面上某点发出的光线，经凸透镜折射后，光线将（）射出。

A.发散 

B.平行 

C.聚交 

D.不

设定目标使用的方法有（）

A、PDPC法；

B、简易图表；

C、直方图；

D、控制图

肠外营养支持时，与发生肝损害并发症关系不密切的是（）。

A.长期过高的能量供给

B.葡萄糖、脂肪与氮量的供给不合理

C.胆汁淤积

D.患者本身有败血症

E.患者本身有胰腺炎