The checkout clerk seemed a bit stunned by the sheer cow - dependency we exhibit . By dinner last night , we were out of milk . As I trudged out into the darkness to collect another couple gallons , I whined to LT that home - delivered milk was sounding better and better to me . Superhero that she is , she looked up local milk delivery for me , and even signed me up to get a call with a quote from Smith Brothers Dairy .

Give answer the following question using evidence from the above passage: What may be the reason they have a cow dependency ?
They drink a lot of milk .