肛管直肠疾病的常见诱因和症状是A．便血 B．便秘 C．肿块 D．疼痛 E．瘙痒

The Kings have been in Beijing for three years, so they are familiar ____ the city. [ ]

A. to

B. with

C. for  

D. on

目前认为志贺菌致病必须具备的条件是（）

A.过度劳累

B.暴饮暴食

C.细菌变异性

D.痢疾杆菌对肠粘膜上皮细胞的侵袭力

E.发病季节

男性，25岁，开始下背部疼痛，骶髂关节活动受限，检查腰椎生理弯曲减小，胸椎弓状后凸，强直，类风湿因子阴性。X线检查骨密度减低，骶骼关节模糊，关节间隙变窄，关节软骨下呈磨玻璃样密度增加带，脊柱普遍性骨质疏松，皮质变薄，脊柱韧带广泛骨化，脊柱呈“竹节”样变而强直，并后突畸形，最可能的诊断是：（）

A、骨质软化症

B、强直性脊柱炎

C、氟骨症

D、类风温性关节炎

E、石骨症

系统性硬皮病________患者血清抗着丝点抗体阳性，此抗体阳性常提示患者不易发生________，而易出现________和________。SCl-70抗体阳性率约20%，_____受累者常阳性。胸、食管及骨关节X线检查________。

Surfing the Internet for fun will make you a better employee, according to an Australian study.

The University of Melbourne study shows that people who use the Internet for their own reasons at work are about 9 percent more productive than those who do not. Study author Brent Coker said, “Surfing the Internet at times helps increase an employee’s attention.”

“People need to relax for a bit to get back their attention,” Coker said on the university’s website. “Having a short break, such as a quick surfing of the Internet, helps the mind to rest itself, leading to a higher total Internet attention for a day’s work, and as a result, increases productivity(生产效率),”he said.

According to the study of 300 workers, 70 percent of people who use the Internet at work surf the Internet for their own reasons during office hours. Among the most popular surfing activities are searching for information about products, reading online news, playing online games and watching videos. “Firms spend a lot of money on software to block their employees from watching video, using social networking sites or shopping online,” said Coker. “That’s not always a good idea.”

However, Coker said the study looked at people who surfed the Internet in moderation (适度), or were on the Internet for less than 20 percent of their total time in the office. “Those who spend too much time surfing the Internet will have a lower productivity than those without,” he said.

小题1:What does the University of Melbourne study mainly show?

A．People who surf the Internet are good employees.

B．Not everyone surfs the Internet for fun during office hours.

C．Surfing the Internet for fun during office hours increases productivity.

D．The Internet is becoming more and more important in people’s life.小题2: According to Paragraph 3, Brent Coker would most probably agree that______.

A．the longer a person’s mind rests ,the better attention he will have

B．surfing the Internet is the best way to increase productivity

C．workers should have a long break during office hours

D．Workers should let their minds rest now and then小题3:Which of the following is NOT mentioned in the passage as one of the most popular surfing activities?

A．Watching videos.

B．Reading online news.

C．Reading online novels

D．Playing online games.小题4:The underlined word “block” in Paragrap4 means “_____”.

A．prevent

B．cycle

C．burst

D．breathe小题5:What can we infer form the last paragraph?

A．Spending too much time surfing the Internet reduces productivity.

B．Those who never surf the Internet have the lowest productivity.

C．Most people don’t surf the Internet in moderation during office hours.

D．People should spend as little time as possible surfing the Internet.