希尔排序法属于哪一种类型的排序法 ______。A) 交换类排序法 B) 插入类排序

南、北回归线附近大陆降水的特点是（　　）

A．西岸降水多

B．沿海降水多

C．东岸降水多

D．内陆降水少

唐代孙思邈的《千金方》，在经络学、腧穴学及针灸治疗学方面都有重要贡献。

书中首次提出的一类腧穴的取法与应用的是：（）

A.十二经穴

B.奇穴

C.募穴

D.五输穴

E.阿是穴

代谢性酸中毒的诊断依据中，错误的是（）。

A.严重腹泻、肠瘘、休克、肾功能不全等病史

B.呼吸浅慢，心率缓慢

C.可伴有缺水症状

D.代偿期血pH可正常

E.HCO₃^-、BE、PaCO₂不同程度降低

E

When I was growing up, 16 was always a magical age, a symbol of maturity, responsibility and of course more independence and freedom.  I sat through the hours of Driver’s Ed classes eager to get out on the road. I couldn’t wait to get my driver’s license.

But it’s a different story for today’s teens. In January, the U.S. Department Transportation released 2012 data that showed only 30.7 percent of U.S. teens got their license at age 16, Twenty years before, that number was almost 45 percent.

There are numbers of reasons for the fall – off. The growing responsibilities like paying for insurance and high gas prices discourage teens from getting behind the wheel. Plus, many teens today are so busy with homework, endless hours of activities and part-time jobs, that finding the time for Driver’s Ed classes may be more difficult that ever.

In addition, many states have raised the driving age, or restricted when teens can drive and who they can have in the car. Parents may also be making their own personal restrictions until they feel their teens are responsible enough to drive safely.

Driving is part of the American culture, but it’s not the central focus like it was 25 years ago. They have so many other things to do now. One of the more interesting factors delaying teens driving might be the change of their social life. Today, teens need to look no further than Face book or other social networking sites to connect with their friends. There is simply less need, maybe less desire, to be able to grab the keys and go.

Michelle Wei got her license as a senior in high school because her digital social life made it easy no to drive. “If I couldn’t get a ride to see my friend who lives a town over,” the 19-year-old said, “I could talk on IM or Skype.”

Research has shown that these online relationships can lead to higher quality friendships, so it isn’t necessarily a bad thing. However, it’s important to find a balance. If old face-to-face friendships are good, why not drive to find them?

小题1:We can infer from the first paragraph that         .

A．Driver’s Ed classes allowed teens to know what maturity was

B．getting a driving license at 16 was a must for American teens

C．16 was considered an age when one could get his driver’s license

D．teens could drive on the road without taking Driver’s Ed classes小题2:What does the passage mainly talk about?

A．Desire to drive on the road declines among American teens.

B．Getting a license costs much more than ever before.

C．Social networking sites are changing the life of American teens.

D．American teens are becoming more responsible than ever.小题3:Michelle’s Wei’s example is used to explain ________.

A．why American teens are crazy about digital social life

B．what social networking websites are bringing to American teens

C．to what degree the Internet is affecting the American car culture

D．what the Internet does to help teens to get a driving license小题4:The last paragraph is reminding the readers that        .

A．the Internet h as a bad effect on the teen’s social life

B．teens should keep a balance in choosing their lifestyle

C．actual contacts can be replaced by talking on line

D．face-to-face friendship is always the best choice

利多卡因抗心律失常的作用机制是

A．提高心肌自律性

B．β受体阻断作用

C．抑制K+外流和Na+内流

D．促进K+外流和Na+内流

E．改变病变区传导速度