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。

Debate over the Useof Renewable Energy

Amusable of Rockefeller Universityin New York, US says the key renewable（可再生的） energy sources, including sun, wind and bibfuls, would all requirevast amounts of land if developed up to large scale production--unlike nuclearpower. That land would be far better________(51)alone, he says. Renewable look_______(52) when they are quite small. But if we start producing renewable energy on alarge________(53), the fallout(结果)isgoing to be horrible.

Amusable draws his conclusions byanalyzing the amount of energy that renewable natural gas and nuclei（原子核）can________(54)in terms of power per squaremeter of land used. Moreover, he claims that_________(55)renewable energy useincreases this measure of efficiency wail decrease as the best land for wind, bibfuls,and solar power gets used up.

Solar power is much more__________(56) than bibful in used but it would still ________(57)150 square kilometers termsof the area of land of photovoltaic（光电的）cellsto match the energy production of the 1000 MW nuclear plant. In another example,he says__________ (58)the 2005 USelectricity demand via wind need 780,000 square kilometers, an area the__________(59)ofTexas poweralone would. However, several experts are highly critical of Amusable's ________(60).John Turner of the USgovernment's National Renewable Energy Laboratory says that even if the US gotall of its_______ (61) from solar energy, it would still need less than half theamount of land that has been _________(62) highways. Further, it need not ________(63)upadditional land. The UScould get a quarter of its energy just from covering rooftops of existingbuildings, he says

According to Turner, the same "dualuse" also_________(64) to wind power footprint for wind is only 5%of the landthat it ___________(65) . Farmers can still farm the land that the turbines areon. Turner says looking solely at land use is an over-simplification of theissue.

51. Aleft     B owned  C held     D bought

52. Afresh    B costly    Cattractive   D dirty

53. Anumber   B scale   C part     Dextent

54. Areduce    B increase  C consume   Dproduce.

55. Asince    B as    C because    D until

56. Aeffective   B important　Cspecial    D efficient

57. Arequire   B show   C collect    Ddiscover

58. Amaking   B Keeping   C meeting    D creating

59. Aform    B size     Cregion    D scope

60. Aconclusions　B decisions  C solutions  D modifications

61. Aforce    B volume   C control   D power

62. A to     B in     C for     D on

63. Agive    B take     Cset      D turn

64. Aapplies   B adapts    Crelates    D appeals

65. Atouches   B faces    C covers   D holds