单选题
Which of the following hypothetical discoveries, if made, would be most likely to reduce the technical difficulties in producing plastic from organic crops?
A、
(A) a source of refining fossil fuels that significantly reduces their cost to plastic manufacturers
B、
(B) a way of maintaining grain yields while producing high quantities of plastic that do not interfere with the functioning of plant chloroplasts
C、
(C) a means of reducing the clean-up cost of environmental damage wrought by CO
2
and SO
2
emissions
D、
(D) a means of yielding greater efficiency from coal-based fuels used in the organic plastic-production process
E、
(E) the discovery of a renewable source of plant-sugar that would lessen reliance on fossil fuels in organic plastic-manufacture
【正确答案】
B
【答案解析】
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