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Giant Structures It is an impossible task to select the most amazing wonder...

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问题 Giant Structures
It is an impossible task to select the most amazing wonders of the modem world since every year more_______ (51) constructions appear. Here are three giant structures which are worthy of our admiration _____ (52 ) they may have been surpassed by some more recent wonders.
The Petronas Towers
The Petronas Towers were the tallest buildings in the world when they were completed in 1999. _______ (53) a height of 452 metres，the tall twin towers,like two thin pencils, dominate the city of Kuala Lumpur. At the 41 st floor，the towers are_________
(54) by a bridge, symbolizing a gateway to the city. The American architect Cesar Pelli designed the skyscrapers. Constructed of high-strength concrete, the building _____ (55) around 1，800 square metres of office space on every floor. And it has a shopping centre and a concert hall at the base. Other _____ (56) 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 Tam Valley，in southern France. At the____________ (57) it was built，it was the world’s highest bridge， 58 over 340 m at the highest point. The bridge is described as one of the most amazingly beautiful bridges in the world.It was built to ______ (59) Millau’s congestion （拥堵）problems. The bridge was built to withstand the ______ (60) extreme seismic（地震的）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 ___________ (61) of a series of dams across the River Parana, ______ (62) 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_________ (63). 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___________ (64) needs. In its construction，the amount of iron and steel used was equivalent to over 300 Eiffel Towers. It is a (65)amazing wonder of engineering.
选项 A. what
B. which
C. who
D. that
答案B
解析本题考查的是非限制性定语从句。A项what、D项that不能引导非限制性定语从句，所以排除A、D，而此处的关系代词引导的是物不是人，即前面出现的the River Parana,所以排除C项who，答案是B。
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