段1：②These habits have helped companies earn billions of dollars when customers eat snacks or wipe counters almost without thinking, often in response to a carefully designed set of daily cues.
段2：①“There are fundamental public health problems, like dirty hands instead of a soap habit, that remain killers only because we can’t figure out how to change people’s habits,” said Dr. Curtis, the director of the Hygiene Center at the London School of Hygiene & Tropical Medicine. ②“We wanted to learn from private industry how to create new behaviors that happen automatically.”
段3：①The companies that Dr. Curtis turned to— Procter & Gamble, Colgate-Palmolive and Unilever—had invested hundreds of millions of dollars finding the subtle cues in consumers’ lives that corporations could use to introduce new routines.
31.According to Dr. Curtis, habits like hand washing with soap .
[A] should be further cultivated
[B] should be changed gradually
[C] are deeply rooted in history
[D] are basically private concerns
答案：A
问：根据原文中的哪几句话可以得出31题的正确答案？（多选题）
A : 段1句②
B : 段2句①
C : 段2句②
D : 段3句①
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