Daisy says, "Tom's getting very profound." What do you think her tone might be? Explain.

Daisy makes this statement in chapter 1 of The
Great Gatsby, and it's clearly a facetious comment made to mock her husband
Tom.

Tom and Daisy Buchanan, Daisy's cousin Nick, and a
friend Jordan are sitting around a table at a rather awkward dinner.  Several glasses of
wine later, the conversation is still rather sparse and awkward, and
then this:

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"Civilization's going to pieces," broke out Tom
violently.

Tom goes on to
extol the virtues of a new book he's read, The Rise of the Coloured Empires
by "this man Goddard." This book apparently warns white people that black
people are getting poised to take over the world, a theory which might have been more
credible at that time; today it would certainly be seen as ridiculous and outrageous. 
Daisy apparently thinks so, too.  The theory espoused, says Tom, is
that

if we
don't look out the white race will be--be utterly submerged.  It's all scientific stuff;
it's been proved.

The very
next line is Daisy's comment to which you refer.  We read that she made her comment
"with an expression of unthoughtful sadness," then goes on to kind of make fun of him
for reading "deep books with long words in them."  While her words may not sound
particularly mocking or sarcastic, Tom interrupts her to defend his position on this
book.  The text says he "insists" and he glances at her "Impatiently."  This
defensiveness is his reaction to Daisy not taking him seriously.  Her tone, then, is
mocking and sarcastic.