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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

时间：2021-09-01 16:40 关键词： 联大 河南师范大学 小学教育（本科) 大学英语Ⅱ

答案解析

D