look at/look into/look in
（1）At the boy's last remark, the bookseller looked at him curiously.
(2) I looked into the boy's serious but eager face and asked him, "Do you want any more books?"
(3) Several girls stopped and looked in one of the glass-topped tables.
上面的 look at, look into 和 look in 有无区别?
这三个介词动词由于介词的不同,其含义是不同的。
look at 意为“朝……看”，其宾语可以是表人的词，也可以是表物的词：
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She looked at him in great surprise ... 她十分惊奇地望着他……
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The teacher told us to look at the blackboard and not at our books. 老师叫我们看着黑板,不要看书。
look in 意为“朝……的里面看”，即把宾语看作是一个空间：
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Look in the cupboard and see if we have any more coffee. 看食橱里是不是还有咖啡。
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look in (into) the mirror 照镜子
look into 除了表示“朝……的里面看”“调查”之外,还常常与 one's face 或 one's eyes 搭配,表示“注视”“窥视”:
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Look into the box. What do you see? 朝箱子里面看。你能看见什么？
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The police are looking into the records of all those involved in the crime. 警察当局正在查阅卷入这个犯罪案件的所有人的档案。
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I'll look into the matter as soon as possible. Just have a little patience. (全国高考,96-10) 我将尽快调查这件事。耐心点。