问题补充：
On the international market, the price of petroleum has been falling down, which is now it used to be.
A. as one third as
B. one third as much as
C. one third more than
D. as one third much as
答案：
A. as one third as
(答案→)B. one third as much as
C. one third more than
D. as one third much as
解析：考查倍数表达法。本题中的倍数是分数的形式one third三分之一；倍数表达有四种：1. “A+倍数+形容词或副词的比较级+than+B”， 2.“A+倍数+as+形容词或副词的原级+as+B”， 3. “A+倍数+the size/height/length/width， etc+of+B”， 4. “……times+what+从句”。本题使用了第2种；句意：在国际市场上，原油的价格已经下降了，现在的几个是原来的3分之一。故B正确。
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