单选题：回答题Giant Structures　　It is an impossible task to select the

回答题
Giant Structures
　　It is an impossible task to select the most amazing wonders of the modem world since everyyear more_______ (51) constructions appear. Here are three giant structures which areworthy of our admiration _______ (52) they may have been surpassed by some more recentwonders.
The Petronas Twin Towers The Petronas Towers were the tallest buildings in the wordwhen they were completed in 1999. _______ (53) a height of ~52 metres, the tall twintowers, like two thin pencils, dominate the city of Kuala Lumpur. At the 41st floor, the towersare_______(54) by a bridge, symbolizing a gateway to the city. The American architectCesar 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 ashopping centre and a concert hall at the base. Other (56) of this impressive buildinginclude double-decker lifts, and glass and steel sunshades.
　　The Millau Bridge The Millau Bridge was opened in 2004 in the Tam Valley, in southernFrance. At the_______ (57) it was built, it was the world's highest bridge, (58)over 340m at the highest point. The bridge is described as one of the most amazingly beautifulbridges in the world. It was built to_______ (59) Millan's congestion problems. Thecongestion was then caused by traffic passing from Pads to Barcelona in Spain. The bridge was built to withstand the _______ (60) extreme seismic and climatic conditions. Besides, it isguaranteed for 120 years!
　　The Itaipu Dam The Itaipu hydroelectric power plant is one of the largest constructions of itskind 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 tocomplete, 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% OfParaguay's and 25% Of Brazil's_______ (64) needs. In its construction, the amount of ironand steel used was equivalent to over 300 Eiffel Towers. It is a _______ (65) amazingwonder of engineering.
请在第____处填上正确答案。 A．wonderful
B．delightful
C．helpful
D．careful