ETF基金上市交易之后，需按交易所的要求，在（）开市前披露当日的申购清单和赎回清单。

____ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.

A．That

B．What

C．In spite of what

D．Though what

如图，与水平面成45°角的平面MN将空间分成I和II两个区域。一质量为m、电荷量为q（q＞0）的粒子以速度从平面MN上的点水平右射入I区。粒子在I区运动时，只受到大小不变、方向竖直向下的电场作用，电场强度大小为E；在II区运动时，只受到匀强磁场的作用，磁感应强度大小为B，方向垂直于纸面向里。

求粒子首次从II区离开时到出发点的距离。粒子的重力可以忽略。

运用专业的方法和技巧消除或者减轻服务对象的困扰的过程中，社会工作者的角色是( )。

A．使能者

B．联系人

C．教育者

D．倡导者

E．治疗者

(一)

The Man of Many Secrets—Harry Houdini—was one of the greatest American entertainers in the theater next century. He was a man famous for his escapes—from prison cells, from wooden boxes floating in rivers, from locked tanks full of water. He appeared in theaters all over Europe and America. Crowds came to see the great Houdini and his "magic" tricks.
Of course, his secret was not magic, or supernatural powers. It was simply strength. He had the ability to move his toes as well as he moved his fingers. He could move his body into almost any position he wanted.
Houdini started working in the entertainment world when he was 17, in 1891. He and his brother Theo performed card tricks in club in New York. They called themselves the Houdini Brothers. When Harry married in 1894, he and his wife Bess worked together as magician and assistant. But for a long time they were not very successful. Then Harry performed his first prison escape, in Chicago in 1898. Harry persuaded a detective to let him try to escape from the prison, and he invited the local newspapermen to watch.
It was the publicity that came from this that started Harry Houdini’s success. Harry had fingers trained to escape from handcuffs and toes trained to escape ankle chins. But his biggest secret was how he unlocked the prison doors. Every time he went into the prison cell, Bess gave him a kiss for good luck—and a small skeleton key, which is a key that fits many locks, pass quickly from her mouth to his.
Harry used these prison escapes to build his fame. He arranged to escape from the local prison of every town he visited. In the afternoon, the people of the town would read about it in their local newspapers, and in the evening every seat in the local theater would be full. What was the result World-wild fame, and a name remembered today.

It can be inferred from the passage that Houdini became famous ______.

A．in 1894

B．before he married

C．at the age of 17

D．when he was about 24

后张法预应力混凝土，当预应力钢筋采用单根粗钢筋时，配套锚具宜采用（）

A.螺丝端杆锚具

B.镦头锚具

C.JM型锚具

D.XM型锚具