PUZZLE POEM

PUZZLE POEM 

My first is a fruit that we all will know 
Full of vitamin C so Google will show 
Oranges 

My second is not as precious as gold 
Used in the Olympics so I am told 
Silver 

My third is welcome on a summer's day
Both beer or milk whatever you say
Pint 

My fourth is a mix of red and blue 
Can be rewarded in war is also true 
Purple 

The answers have one thing so unique 
I'm sure you all know but let me speak 
These are words that cannot rhyme 
I would give you more but haven't the time