防水混凝土在受冻融作用的工程上使用时，应优先选用（）。
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The author writes Paragraph 3 in order to______.
A. prove the ineffectiveness of the theory of Walter Mischel
B. further demonstrate how the brain functions when facing temptation
C. state the importance for people to go on a diet
D. manifest the harm food like chocolate cakes will do to people"s health
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