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  3. Giant Structures It is an impossible task to select the most amazing wonders of the modern world since every year more【C1】__

Giant Structures It is an impossible task to select the most amazing wonders of the modern world since every year more【C1】__

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问题                         Giant Structures
    It is an impossible task to select the most amazing wonders of the modern world since every year more【C1】______constructions appear. Here are three giant structures which are worthy of our【C2】______although they may have been surpassed by some more recent wonders.
    The Petronas Twin Towers
    The Petronas Towers were the tallest buildings in the world when they were completed in 1999. With a【C3】______of 452 metres, the tall twin towers, like two thin pencils, dominate the city of Kuala Lumpur. At the 41st floor, the towers are linked by a bridge, symbolizing a gateway to the city. The American【C4】______Cesar Pelli designed the skyscrapers.
    Constructed of high-strength concrete, the building provides around 1,800 square metres of office space【C5】______every floor. And it has a shopping centre and a concert hall at the base. Other【C6】______of this impressive building include double-decker lifts, and glass and steel sunshades.
    The Millau Bridge
    The Millau Bridge was opened in 2004 in the Tarn Valley, in southern France.【C7】______the time it was built, it was the world’s highest bridge,【C8】______over 340m at the highest point. The bridge is described as one of the most amazingly beautiful bridges in the world. It was built to【C9】______Millau’s congestion problems. The congestion was then caused by traffic passing from Paris to Barcelona in Spain. The bridge was built to withstand the【C10】______extreme seismic and climatic conditions. Besides, it is guaranteed for 120 years!
    The Itaipu Dam
    The Itaipu hydroelectric power plant is one of the largest constructions of its kind in the world. It consists of a series of dams across the River Parana,【C11】______forms a natural border between Brazil and Paraguay. Started in 1975 and taking 16 years to complete, the construction was carried out as a joint project between the two【C12】______. The dam is well-known for both its electricity output and its size. In 1995 it produced 78% of Paraguay’s and 25% of Brazil’s【C13】______needs. In its construction, the【C14】______of iron and steel used was equivalent to over 300 Eiffel Towers. It is a【C15】______amazing wonder of engineering.
【C7】
选项 A、At
B、within
C、from
D、upon
答案A
解析 句意为：——建成时，它是世上最高的桥。at the time表示“在那时，那时候”，为固定搭配。四个选项：at“在……时刻”；within“在……之内”；from“从……”；upon“在……之上”。
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