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You can do it by creating a “Form” in Google Drive (open Drive, click the red “Create” button and select “form” from drop down options), then create a survey with questions and answer options under each question. Once you have completed it and saved it, you can embed it in a Google+ post. I don’t know of a more elegant way to do it, perhaps someone else does though. Here are some more thorough instructions on how to use the “Form” method, if you need them.