4. which choice is a question you should not ask yourself when evaluating an informative speech? did the speaker present a clear opinion on the topic? are there effective transitions?

C. Did the speaker present a clear opinion on the topic?

Why? Because its an information speech it shouldn't be opinion based.

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."

the answer is   c the cold war