某企业的网络拓扑结构如图4所示，请回答以下有关问题。如图4所示，要求在防火墙上通过A

象的奔跑速度大约每分钟500米，羚羊奔跑的速度是象的4.2倍少11米，羚羊每分钟跑多少米？合多少千米？

Aggie Bonfire (篝火) was a long-standing tradition at Texas A&M University as part of the college rivalry (竞争) with the University of Texas at Austin. For 90 years, Texas A&M students—known as Aggies—built and burned a bonfire on campus each autumn. Known to the Aggie community simply as "Bonfire", the annual autumn event symbolized Aggie students' "burning desires”. The bonfire was traditionally lit around Thanksgiving in connection with festivities surrounding the annual college football game.

Although early Bonfires were little more than piles of trash, as time passed, the annual event became more organized. Over the years the bonfire grew bigger, setting the world record in 1969. Bonfire remained a university tradition for decades until, in 1999, a collapse during construction killed twelve people—eleven students and one former student—and injured twenty-seven others.

The accident led Texas A&M to declare a pause on an official Bonfire. However, in 2002, a student-sponsored-and-off-campus "Student Bonfire" came up.

In 2003, the event became known as Student Bonfire. In a design approved by a professional engineer, Student Bonfire uses a wedding cake design, but, in a departure from tradition, every log in the stack (堆) touches the ground. For added support, four 24 feet poles are spaced evenly around the stack and then bolted to the 45 feet center pole with a steel pipe. Since the group does not receive funding, Student Bonfire charges a fee to each attendee to cover expenses. Attendance for Student Bonfire ranges from 8,000–15,000 people and the event is held in Brazos County or one of the surrounding counties.

小题1:When did Aggie Bonfire come into being?

A．In 2003.

B．1999.

C．1909.

D．2002.小题2: Which of the following statements is true according to the above passage?

A．Texas A&M University started Aggie Bonfire.

B．The University of Texas at Austin started Students Bonfire.

C．Texas A&M University and The University of Texas started Students Bonfire.

D．Texas A&M University and The University of Texas started Aggie Bonfire.小题3:Why did Aggie Bonfire once stop?

A．Too many people wanted to join in it.

B．Some serious accidents occurred during the activity.

C．It ran out of fund and then stopped.

D．There were no official supports.小题4: Which of the following might serve as the best title of the whole passage?

A．From Aggie Bonfire to Student Bonfire.

B．A brief history of American Bonfire.

C．Why not join Bonfire?

D．Bonfire in Texas of the United States.

从社会学角度看调查总体的实质是什么？以及怎样研究它？

货币就是从商品中分离出来的充当一般等价物的商品。（）

超声对人体有哪些生物学效应（）

A.热效应

B.空化作用

C.机械作用

D.电离效应

E.核辐射效应