The significance of Brocklehurst’s research is that ______. Commercial application of the research finding will be possible if

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问题 The significance of Brocklehurst’s research is that ______.
Commercial application of the research finding will be possible if salad cream can be made resistant to bacterial attack ______.

选项 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

答案D

解析 依据是最后一段相关内容,注意:该句中的while是时间概念,相当于in the course of。
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