According to media reports the London stadium is other Olympic stadiums in terms of steel

问题补充：

According to media reports, the London stadium is other Olympic stadiums in terms of steel used.

A. as 75% light as

B. 75% lighter as

C. 75% lighter than

D. as light as 75%

答案：

A. as 75% light as

B. 75% lighter as

(答案→)C. 75% lighter than

D. as light as 75%

解析：考查倍数的表达：句意：根据医学报告，就使用的钢铁而言，伦敦体育馆比其他奥运体育馆轻75%。使用的是倍数+比较级+than的结构，AD项的75%应该在前面，B项应该是as light as，选C。