第6部分：完形填空(第51～65题，每题1分，共15分)

　　下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。

　　giant structures

　　it is an impossible task to select the most amazing wonders of the modern world since every year more___1__constructions appear. here are three giant structures which are worthy of our ___2__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___3__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___4__cesar pelli designed the skyscrapers.

　　constructed of high-strength concrete, the building provides around l, 800 square metres of office space___5__every floor. and it has a shopping centre and a concert hall at the base. other __6__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. ___7__the time it was built, it was the world's highest bridge, ___8__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 ___9__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___10__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, ___11__forms a natural border betweenbrazil6 and paraguay. started in 1975 and taking 16 years to complete, the construction was carried out as a joint project between the two___12__. the dam is well-known for both its electricity output and its size. in 1995 it produced 78% 0f paraguay's and 25% 0f brazil's___13__ needs. in its construction, the___14__of iron and steel used was equivalent to over 300 eiffel towers. it is a___15__amazing wonder of engineering.

　　51. a. wonderful b. delightful c. helpful d. careful

　　52. a. when b. although c. if d. because

　　53. a. in b. with c. above d. on

　　54. a. designed b. located c. built d. linked

　　55. a. costs b. sits c. stands d. provides

　　56. a. features b. types c. tasks d. roles

　　57. a. place b. map c. time d. view

　　58. a. developing b. reaching c. expanding d. lasting

　　59. a. restrict b. replace c. relieve d. relax

　　60. a. much b. more c. less d. most

　　61. a. consists b. makes c. sets d. uses

　　62. a. what b. who c. that d. which

　　63. a. countries b. provinces c. members d. regions

　　64. a. water b. energy c. oil d. food

　　65. a. mainly b. hardly c. rarely d. truly