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

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

出自：河南师范大学-小学教育（本科)-大学英语Ⅱ

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