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

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

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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                      【B1】 ______
world’s tallest freestanding tower and a symbol of Canadian
achievement recognized around the world. This architectural
triumph is an engineering wonder of the modem 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 and dining destination and                 【B2】 ______
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               【B3】 ______
giant fades nearly to black. Not anymore. Last week, it was                      【B4】 ______
illuminated for the lust 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             【B5】 ______
the old scheme. It is an energy efficient, costly effective and                  【B6】 ______
architecturally stunning result that whole Canadians can be proud of.            【B7】 ______
On a clean night, residents will be able to spot the illuminated tower.          【B8】 ______
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                       【B9】 ______
throughout Canada. Throughout the year, the lighting will pay
attribute to national holidays, special occasions and some citywide              【B10】 ______
events.
选项
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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