正常肾内围绕着肾窦的回声较低的结构是（） A.肾实质 B.肾皮质 C.肾髓质 D.肾

请将下列珍稀动物与其所属类群用线连接起来．

中华鲟                       哺乳类

金丝猴                       鱼类

朱鹮                         爬行类

扬子鳄                       鸟类．

女性，65岁，行走时不慎摔倒，右臀着地，伤后右髋痛，不能站立行走。检查见患肢短缩，有内收外旋60°畸形，大粗隆上移。其诊断最可能是

A．髋关节后脱位

B．股骨颈骨折

C．股骨转子间骨折

D．右骶髂关节脱位

E．骨盆骨折

______叫做机械运动．

阅读理解。

     Each new school year brings fresh reminders of what educators call the summer learning gap. Some

call it the summer learning setback. Simply speaking,it means the longer kids are out of 'school,the more

they forget. The only thing they might gain is weight.

     Most American schools follow a traditional nine-month calendar with winter and spring breaks and

about ten weeks of summer vacation. Some schools follow a year-round calendar. They hold classes for

about eight weeks at a time,with a few weeks off in between. The National Association for Year-Round

Education says there were fewer than 3,000 such schools at last count. They were spread among forty-six of the fifty states.

     But many experts point out that the number of class days in a year-round school is generally the same

as in a traditional school. Lead researcher Paul von Hippel said,"Year-round schools don't really solve the problem of the summer learning setback. They simply spread it out across the year.

     Across the country,research shows that students from poor families fall farther behind over the summer than other students. Experts say this can be prevented. They note that many schools and local governments offer programs that can help.

     But calling them "summer school" could be a problem. The director of the summer learning center at

Johns Hopkins,Ron Fairchild,said research with groups of different parents in Chicago and Baltimore

found that almost all strongly disliked the term "summer school". In American culture,the idea of summer

vacation is connected to beliefs about freedom and the joys of childhood. The parents welcomed other

terms like "summer camp," "extra time" and "hands-on learning. "

1. According to the first paragraph,the summer learning gap ____

A. helps children to gain weight        

B. leads children to work harder

C. improves children's memories      

D. affects children's regular studies

2. Compared to traditional schools,students in the year-round ones _____

A. perform better and have more learning gains

B. have much less time for relaxation every year

C. have generally the same number of class days                      

D. hold more classes with more free weeks off

3. Which of the following statements is true?

A. Students from poor families often fall behind after the vocation.

B. Year-round schools can solve the problem of the learning gap.

C. There are schools in each state following a year-round calendar.      

D. Nothing can help the students who fall behind after the vocation.

4. Why did almost all parents dislike the term "summer school"?

A. They cherish the children's rights of freedom very much.

B. They are worried about the quality of the "summer school".    

C. They want their children to be forced to make up the gap.

D. They can't afford to the further study during the vacation.

5. What would be the best title of this passage?    

A. Opening Summer Camps

B. Forbidding Summer Schools

C. Spreading Year-Round Education

D. Minding the Summer Learning Cap  

目前疗效好、副作用小、口服吸收完全、应用最广泛的解热镇痛药是()。

A．安乃近

B．阿司匹林

C．去痛片

D．双氯芬酸钠

E．对乙酰氨基酚