What does the idiom 'thick and fast' mean?

[Julia]

Test No. express/advan-15 "Teaching your Family to Drive", question 6

Since we put that advertisement in the local newspapers, replies have been coming in thick and fast.

(a) quickly in large numbers
(b) slowly in small numbers
(c) quickly in small numbers
(d) slowly in large numbers

Test No. express/advan-15 "Teaching your Family to Drive", answer 6

Since we put that advertisement in the local newspapers, replies have been coming in quickly in large numbers.

Correct answer: (a) quickly in large numbers
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hello, my name is Julia, i come from germany and i have a big problem.we will write a test about advertisement.we will have to descripe an advertisement with the AIDA rule. Can you help me?

[Alan]

Hi,

Just a couple of questions; when you say we - who are we? And the other question: what is the AIDA rule?
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English as a Second Language
You can read my ESL story Present Simple

[Torsten]

Hi Julia,

Are you referring to

Attract
Interest
Desire
Action?

Well, you would have to pick an advert which we can use to demonstrate how the ADIA formula works.

TOEIC short conversations: Giving directions