下列关于影响SE序列上静止组织信号强度因素的叙述，正确的是（） A．TR越长，信号强

督察警察是对公安机关的人民警察和人民群众执行法律、法规、遵守纪律的情况进行监督的警察。( )

什么是女性青春期发育过程中的里程碑（）。

A. * * 发育

B.音调变高

C.出现阴毛、腋毛

D.月经来潮

E.排卵

为降低生产成本，某火力发电企业进军煤炭行业，自主供应原材料。该企业采取的企业战略是（）。

A.前向一体化战略 

B.后向一体化战略 

C.转向战略 

D.差异化战略

Directions: Read the following passage. Answer the questions according to the information given in the passage and required words limit. Write your answers on your answer sheet.

Most American school have boys and girls in the same classroom. But a public high school in the small, rural town of Boonsboro, Maryland, offers a special program. Top students in the ninth and tenth grades can attend single-sex classes for math, science, English and social studies.

The aim is to help teenagers keep their minds on their work by keeping males and females apart. Rebecca Brown chooses the students for what Boonsboro High School calls the Academy.

Placement in the Academy is voluntary.

Students are invited after middle school. They need high marks and test scores and strong teacher recommendations. They also need to be involved in activities.

Michael Bair has been at Boonsboro High for twenty years and directs the Academy. His ninth-grade English class for boys centres on books that he believes boys find interesting. He says, “The novels they're reading now are very manly novels. They're novels that deal with the arrogance（傲慢） of man and the pride of man.”

Morgan Van Fleet is a senior at Boonsboro High. She likes being in the Academy. She says boys and girls act differently when they are together in the classroom. She says, “To me, it almost seems like preventing your chances of developing yourself because you’re more focused on ‘Oh, I wish they'd shut up. Oh, what do they think of me?’, instead of focusing on ‘What's the homework? What's going on in this class? Or what's the lesson?''' There is one activity that girls and boys in the Academy do together. At the end of the day, many of them stay and help tutor（辅导） students who are having trouble in school.

小题1:Why does this high school offer such a program? （No more than 16 words）

__________________________________________________________________________

小题2:What requirements should a student meet if he / she wants to be invited after middle school?

（No more than 12 words）

__________________________________________________________________________

小题3:What activity do boys and girls share after school? （No more than 10 words）

__________________________________________________________________________

小题4:What is the main idea of this passage? （No more than 10 words）

__________________________________________________________________________

行政立法行为的内容涉及对行政法律规范的（）。

A.制定

B.执行

C.修改

D.废止

E.变更