True or false: concluding a speech by returning to the introduction is often a great way to end.

That statement is false.
Concluding a speech need to be done by summarizing the main point that the speaker wanted to tell the audience.
Returning to the introduction will destroy the flow of the speech and make the audience become confused on what message the speaker actually wants to convey.

Bob: coke is baby pandas.jim: what? how do you figure that coke is baby pandas? bob: because this book says so.jim: how do we know the book is correct? bob: because it says that coke is baby pandas.jim: how does that prove the book's accuracy? bob: because it's statement involving coke and baby pandas is correct, therefore it is accurate.jim: how do we know that it's correct? bob: because we have concluded that the book is accurate, and therefore the statement is correct.therefore, coke is baby pandas.