— Nowadays China has about 25,000 kilometers of high-speed railways.

— That's of the world's total.

A. two third B. two-third C. two thirds D. two three

C 【解析】 句意：——現(xiàn)在中國(guó)有大約25000公里的高速鐵路�！@是世界總量的三分之二。一般情況下，表示分?jǐn)?shù)時(shí)，分子要用基數(shù)詞，分母要用序數(shù)詞，如果分子大于1，表示分母的序數(shù)詞要用復(fù)數(shù)形式，如：two thirds 三分之二。故答案為C。
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