On June 15th，2012，millions of people watched as 33yearold Nik Wallenda walked across one of the world's greatest waterfalls on a tightrope(钢丝)．What made the 25－minute walk that was televised live and watched by over 13 million people worldwide even more amazing，is that it was done over the Niagara Falls－An action that had never been attempted before.
Even though Nik was wearing a harness(保护带)，a safety measure provided by ABC，the television network that broadcast the event，his action to keep his balance against the strong winds made for some heart－stopping(令人担忧的) moments for the audience.
Nik，however，never slowed down for even one moment.Wearing special shoes made by his mother，he remained totally focused on the job at hand.It was only when he got to the last stretch near Canada's Table Rock that he knelt down on one knee and finally broke into a smile.Waving and blowing kisses to the cheering audience，he knew he had acplished a great task，which most people had thought impossible.
While he described the whole experience as peaceful and relaxing，Nik said his biggest challenges came from a totally unexpected source－his 40 pound balancing pole.The balancing pole was so heavy that he could hardly carry it on the tightrope.
One would think that now that Nik has realized his lifelong dream he would be ready to hang up his “balancing pole”．However，the adventurer who already has seven Guinness World Records under his belt，is just getting started－Next up? A 5，000－foot tightrope walk across the Grand Canyon.While the one across the Niagara Falls took years of planning because he had to convince the US and Canadian officials，this one should happen in the very near future.That's because，the Florida resident has already been granted(授予) a permit by the Canyon officials.
【小题1】Why did so many people fix their attention on the event?
A．Because it was done by Nik Wallenda.
B．Because nobody had done it there before.
C．Because it was broadcast live by ABC.
D．Because it was impossible to do the event.
【小题2】What made the audience hold their breath during Nik's performance?A．How Nik managed to cross the Niagara Falls with safety measure.B．What Nik would do when he lost his balance on the tightrope.C．How Nik kept his balance against the strong winds.D．How long Nik will take to finish the event.【小题3】What was the greatest difficulty for him to face in Nik view?A．The supplied tightrope.B．The safety belt.C．The balancing pole.D．The audience's noise.【小题4】What does the last paragraph mainly talk about?A．Nik will go on with his dream.B．Nik's life dream is changing.C．Permission of governments is important.D．The Grand Canyon is a dream for Nik.B
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(答案→)B
解析： 文章主要讲述了在2012年6月15日Nik Wallenda完成了在尼亚加拉瀑布上走钢丝的表演。
【小题1】B 细节理解题。根据文章首段尾句“it was done over the Niagara Falls－An action that had never been attempted before.”可知：之前没有人在尼亚加拉瀑布上完成过尝试。
【小题2】C 细节理解题。根据文章第二段“his action to keep his balance against the strong winds made for some heart－stopping(令人担忧的) moments for the audience.”可知答案。
【小题3】C 细节理解题。根据第四段首句中的“Nik said his biggest challenges came from a totally unexpected source－－－his 40 pound balancing pole.”可知答案。
【小题4】A 主旨大意题。最后一段主要讲Nik虽然实现了在the Niagara Falls的空中漫步，但是他不会让自己的梦想就此结束，下一个目标就是the Grand Canyon。