经过深层分析的信息比经过表层分析的信息记得更牢的记忆方法，如采用补充细节，举出例子，或使之与其他观念形成联想等，这种促进知识保持的方法是（ ）。

(单选题)Much work is needed to ensure that by 2020 the percentage of (单选题)Alipay, which currently has over 520 million users, is a pow (单选题)—David has been ______ since he got the offer in this compan (单选题)The best book are treasuries of good words and golden though (单选题)—I didn’t go swimming yesterday. What about you?—______, bec (单选题)______, British scientist Steven Hawking opened an account o (单选题)The book was so interesting that he had read it for four hou (单选题)Please choose a person to ______ your group to take part in (单选题)Smile costs ______, but it gives so much, so we should learn (单选题)President XI Jinping welcome online criticism from netizens,