In the first Harry Potter book, what did Fred and George throw at Voldermort's face?

Correct!!!!

Snowballs because it says Fred and George throw snowballs at the back of Quirrels head and Voldemort is at the back of his head!

Snowballs?

I'll give you a clue. it is one of the following:
snowballs
snowman
chair
dirt
apples
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You can only answer once. So choose carefully. if you answer more than once, i won't reply to your answer.