什么叫静摩擦、动摩擦、滚动摩擦、滑动摩擦？

分别属于基督教、伊斯兰教、佛教的节日是（ ）。

A．圣纪节、开斋节、泼水节

B．复活节、古尔邦节、圣纪节

C．复活节、圣纪节、泼水节

D．圣诞节、呈仙节、复活节

上颌切牙

A．上牙槽后神经+腭前神经
B．下牙槽神经+颊长神+舌神经
C．上牙槽前神经+鼻腭神经
D．下牙槽神经+舌神经
E．上牙槽中神经十上牙槽后神经+腭前神经 拔除下列牙时，应麻醉哪组神经

A latest national survey has found that over half of China's netizens are suffering from various mental problems although some 62 percent of them claim at the same time that they are happy on the whole anyway.

This is the result of China's first White Paper on Netizens' Health Conditions issued on Wednesday by 39.net, China's largest authoritative website on health sciences. It is the first most comprehensive health survey on netizens' health situation ever conducted in China in ten years' time. The white paper came out after two months of online and offline research that involved over 150 thousand netizens, covering topics and questions on health knowledge, mental situation, sense of health, and living habits.

According to the white paper, more than 70 percent of China's netizens say they are suffering from mental problems such as bad memory, anxiety, depression, and a lack of confidence. And a similar 72 percent of them also say they are often suffering from diseases like insomnia, dizziness, joint degeneration and achings. Meanwhile, another 53 percent of netizens believe that white collar employees who have bigger work pressures are more likely to catch mental problems.

The white paper adds, doing almost no sports and spending long time surfing online lead to the above mentioned health problems among netizens. Only 9 percent of netizens take up sports on weekends while over 40 percent stay home, surfing. And only 16 percent netizens can assure more than eight hours' sleeping daily.

At present, China has a netizen population of 162 million, with a monthly consumption of 186 yuan, or about 25 dollars, on Internet surfing.

小题1:The national survey on netizens' health situation ________.

A．was conducted by sohu.com

B．is conducted every year

C．was carried out online and offline

D．covered about half a million netizens小题2:Which of the following has the closest meaning to the underlined part "white collar"?

A．White clothes.

B．White offices.

C．Office workers.

D．White people.小题3:All the following factors have been mentioned to cause the health problems among netizens EXCEPT ________.

A．doing no sports

B．spending long time online

C．heavy work pressures

D．shopping online小题4:

有以下程序： void sort(int a[]，int n) { int i,j,t; for(i=0;i＜n-1;i+=2) for(j=i+2;j＜n;j+=2) if(a[i]＜a[j]){t=a[i];a[i]=a[j];a[j]=t;} } main() { int aa[10]={1,2,3,4,5,6,7,8,9,10},i; sort(aa,10); for(i=0;i＜10;i++) printf("%d",aa[i]); printf("\n"); } 其输出结果是( )。

A．1,2,3,4,5,6,7,8,9,10，

B．10,9,8,7,6,5,4,3,2,1，

C．9,2,7,4,5,6,3,8,1,10，

D．1,10,3,8,5,6,7,4,9,2，

右边四个选项中有一项可以由给出图形折叠得到，请找出来。（）

A.选项A

B.选项B

C.选项C

D.选项D