下列哪项不是内脏性腹痛的特点 （） A.疼痛部位含混 B.疼痛部位接近腹中线 C.

阅读理解。

     It is over a year now since Cathy came to China. She is now living in Nanjing and has worked in a

computer factory for six months. The factory is in the north of the city, and her flat is in the south. But,

she has never been late for work. Cathy is very popular in the factory. She is kind to everybody and gets

on well with the Chinese workers. After work, in the evenings they visit each other and talk about almost

everything.

     However, Cathy has made up her mind to leave the factory. She is going to find a job in a travel service (旅行社).  "If I work in a travel service, I’ll be able to meet more people. J can learn more about China,"

she told her friends.

     One day last week she had a talk with the manager of the travel service.  He seemed pleased with her Chinese. At the end of the talk, he said, "I'll give you a ring in a week and tell you the result.” Now Cathy

is waiting for the answer. 

1. Cathy has been in China for______.

A. more than a year

B. half' a year

C. two and a half years

D. two years

2. She is______for work.

A. always late

B. always on time

C. never on time

D. often late

3. Almost in the factory knows Cathy______.

A. nobody

B. somebody

C. everybody

D. anybody

4. She wants to work in ______because shewants to know more about China and the Chinese people.

A. the south

B. the hometown

C. the north

D. the travel service

5. Cathy's ______must be quite good.

A. Chinese

B. maths

C. Japanese

D. physics

简谐横波某时刻波形图如图所示，a为介质中的一个质点，由图象可知

A．质点a加速度方向一定沿y轴负方向

B．质点a的速度方向一定沿y轴负方向

C．经过半个周期，质点a的位移一定为负值

D．经过半个周期，质点a通过的路程一定为2A

纳税人发生的下列佣金，可计入销售费用的有( )。

A．支付的不超过服务金额5%的个人佣金

B．支付给独立的从事中介服务的纳税人的销售佣金，并取得正式发票

C．支付给本企业雇员的佣金

D．支付给个人的超过服务金额5%的佣金

下述细胞属于永久细胞的是（）

A.造血细胞

B.表皮细胞

C.肝细胞

D.心肌细胞

E.肾小管细胞

大气层与现在大气层成分明显不同的是没有氧气。（）