as cold as charity 冷冰冰
A：What's the matter with him?
B: I don't know,what's wrong?
A: I feel he is as cold as charity to me.
B: Maybe you should ask him openly.
as alike as two peas in a pod 一模一样
A：Can you tell Bob from Tom?
B: How can I? They're as alike as two peas in a pld.
A: Don't you notice that Bob has a mole on his face,but Tom doesn't?
B: You really have keen eyes.