单选题
Commercial application of the research finding will be possible if salad cream can be made resistant to bacterial attack ___________.
A、
by varying its chemical composition
B、
by turning it into a solid lump
C、
while keeping its structure unchanged
D、
while retaining its liquid form
【正确答案】
D
【答案解析】
辨认事实题。题目询问通过什么方式使沙拉奶油对细菌有免疫力,从而使这项研究变得有实用价值。从文章最后一段最后一句得知:“关键在于保持沙拉奶油的液体形态,而不变成固体。”故[D]正确。
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