According to MLA guidelines which is the correct way to cite an in Text quotation

You are reading an informational text for english class, and you find a lot of words you don't know. your teacher says you don't need to look up all of them in the dictionary, only the ones you need to get the main point of the text. how could text features you figure out which words to look up?

Ineed quick me on this one and others

Public opinion polls are used in marketing