耕地承包期为( )年。 A．20 B．30 C．50 D．70

内环境是指

患者，男，56岁，有心房纤颤病史5年，吸烟史20余年。发作时不能说出物品的名字，但可正确使用。2周来共发生过5次，每次持续2～l5分钟。查体无神经系统异常。

该患者头颅CT未见异常，其可能的原因是（）

A.患者并非颅内病变

B.发病时间短，未显影

C.病灶小，未发现

D.患者病灶区神经细胞仅为功能障碍，无形态异常

E.患者为脑缺血发作

阅读理解。

      American children and teenagers have increased their use of entertainment media by more than one hour

a day in the last five years. On an average day they now spend seven and a half hours using media.

     These are the findings of a new survey. It included not only devices like TVs, computers, mobile phones

and MP3 players, but also media like books and magazines. It did not count media use for school.

     Vicky Rideout at the Kaiser Family Foundation, a health re- search group, wrote the report. She was

surprised that kids could fit even more media time into their day.

     She found that they spent ten hours and fortyfive minutes if you counted each device individually. But

children multi-task a lot, and Vicky Rideout says this is not necessarily a good thing. "

     People who study the brain will tell you that you can't actually multitask in that way. You're really

switching back and forth in order from different tasks, just doing it rapidly, and that you don't really do either

task as well as you would do them if. you did them one at a time." she added.

     The study suggests a link between heavy media use and lower performance in school. About one-fourth of

those who used media the least reported that their grades were mostly average or below. But that was true of

half the heavy media users.

     So where are the parents? Children who had any rule limiting the use of any kind of media were exposed to

an average of about three hours less media a day. But only one-third of children had to follow any rules.

     Girls spent more time than boys on social networking sites, lis tening to music and reading. Boys spent

more time on video games-an average of forty eight minutes more a day than girls.

     Vicky said "It looks like the girls just sort of lose interest in the games and they drop off and start doing

other things, whereas the boys' interest remains strong."

     Some other findings: Time spent reading books has not dropped in the last five years. But time with

newspapers and magazines has, though some reading now takes place online.

1. What is worrying about American children and teenagers according to the survey?

A. The burden and pressure of study after school.

B. The money spent on the entertainment media.

C. Their increased time spent on entertainment media.

D. The lost control of their entertainment activities.

2. What does the underlined word "multitask" mean?

A. Doing different tasks without being permitted.

B. Carrying many tasks at the same time.

C. Doing some illegal things out of school.

D. Only doing one task in the limited time.

3. The underlined sentence in Paragraph 7 means____.

A. Parents should watch children while they are using media

B. Parents shouldn't allow children use media at all

C. Parents should hide and give children free space

D. Parents should play an important part as a director

患者女，30岁。因十二指肠球部溃疡而行手术治疗，术后出现十二指肠瘘，给予禁食、胃肠减压、瘘液外引流及静脉营养等治疗，5d后患者出现嗜睡、呼吸改变，血压下降。

患者出现上述症状的原因是（）

A.低渗性脱水

B.代谢性酸中毒

C.呼吸性酸中毒

D.代谢性碱中毒

E.CO₂结合力升高

患者，女，32岁，已婚。产后3日，小腹隐隐作痛，按之则舒，恶露量少、色淡、质稀，腰酸乏力，头晕耳鸣，大便干燥，舌淡红苔薄白，脉虚细治疗应首选（）

A.归脾汤

B.肠宁汤

C.保阴煎

D.八珍汤

E.生化汤