【单选题】【消耗次数：1】
以时间为标准，在同一时间对某个年龄组或几个年龄组的儿童的心理发展进行研究的方法属于
①
横向研究
②
纵向研究
③
平行研究
④
实证研究
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I am very shy
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technology
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knowledge
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examination
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because
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since
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thinking
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think a lot
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to think
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thought
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Yes, it was rich and colorful
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No, it is interesting
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I like my college very much
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yes, it is.
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seems to be
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must be
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remains
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take
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①
making
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make
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made
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advantage
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disadvantage
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problem
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get
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give
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take
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gain