【单选题】Oil refiners can refine a barrel of petroleum so that it yields either more home heating oil or more diesel fuel. If the price of diesel fuel falls, there is
A.
an increase in the supply of home heating oil.
B.
a decrease in the supply of home heating oil.
C.
an increase in the quantity of home heating oil supplied.
D.
a decrease in the quantity of home heating oil supplied.
【简答题】将下列段落翻译成中文 Bio-diesel is best developed in EU.Its main raw material is colza oil. In 2003, yield of bio-diesel in Europe was more than 1.76 million tons. It is expected that by 2010, the number would ...