Standing tall as the defining landmark of Toronto is the CN Tower, Canada’s National Tower. On 553.33 metres, it is the world

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问题    Standing tall as the defining landmark of Toronto is the CN
   Tower, Canada’s National Tower. On 553.33 metres, it is the world’s 【S1】______
   tallest freestanding tower and a symbol of Canadian achievement
   recognized around the world. This architectural triumph is an
   engineering wonder of the modern world and widely regarded as the
   iconic symbol of tourism for Toronto. With breathtaking views from
   three observation levels, the CN Tower is a worldly class entertaining 【S2】______
   and dining destination and must-see attraction when visiting Toronto.
   The CN Tower has dominated Toronto’s skyline during daylight
   hours since it opened 31 years before. But at night, the dimly lit giant 【S3】______
   fades nearly to black. Not anymore. Last week, it was illuminated 【S4】______
   for the first time in a dazzling light show. CN Tower can now claim
   to be the world’s tallest illuminated structure. The newly lit tower
   will consume up 60 percent less electricity than the old scheme. It 【S5】______
   is an energy efficient, costly effective and architecturally 【S6】______
   stunning result that whole Canadians can be proud of. On 【S7】______
   a clean night, residents will be able to spot the illuminated 【S8】______
   tower. It is hoped that the new lighting will help end Toronto’s five-
   year tourist slump. It will serve as a beacon for tourism representing
   extraordinary experiences that can be found in Toronto and throughout 【S9】______
   Canada. Throughout the year, the lighting will pay attribute to national 【S10】______
   holidays, special occasions and some citywide events.
【S1】

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答案on改成at

解析 本题辨析介词的用法。介词at之后可以跟表示速度、价格、高度和距离的名词词组,如at 60 kilometres per hour,at thirty cents a pound,at twenty paces等。而介词on没有这样的搭配。
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