(a) A librarian works in / at the library. / A librarian is in charge of a library. All three are correct, but have slightly different meanings.
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(a) A librarian works in / at the library. / A librarian is in charge of a library.All three are correct, but have slightly different meanings. Also, the switch between indefinite and definite articles in your first two examples sounds odd.
(b) A grasshopper looks / looks like a praying mantis.I don't understand the distinction you're trying