In this section of his speech, churchill discusses the losses great britain suffered in the battle of dunkirk. which of the following details is not essential to the main idea of this paragraph?

in the section of speech is not

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.