Please, give a synonym for "trades in" in this sentence:
"The rhetoric trades in exclusive oppositions, and this use of friend versus enemy is common."

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If I had to use one word, I would say "features." Some other possible rough equivalents:

"is composed of"

"is characterized by"

"makes use of"

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Good question.

In this case, "trades" means something like "specializes in".

This is not a common expression, but I hear it once in a while.

Neste caso, “trades” significa algo como “especializado em”.

Esta não é uma expressão comum, mas ouço-a de vez em quando.

Good luck!