Why are some animals pets and others lunch？

In some countries，dogs and cats are commonly considered as pets，while chickens，ducks，and （46）　　（猪） are food．However，in some other countries dogs and cats are food，and the food animals are pets．

People （47）　　（分开，将…分成） animals into several kinds to their own needs．For example，you may have （48）　　（朋友） who keep rabbits as pets．Some people （49）　　（烹饪） rabbits as dishes．People treat a rabbit as a pet because it （50）　　（带来） them pleasure．They eat it，for they think it is a kind of meat．They kill it because they believe it is （51）　　（有害的） to plans or people，

People also treat animals differently based on their own cultures．Most of us have dogs as pets．Dogs live in our house，like a （52）　　（成员） of the family．However，in some cultures，dogs

are considered unclean．People （53）　　（几乎不） ever keep them as pets．In some parts of Southeast Asia，dogs are on the menu．（54）　　（百万） of dogs are killed every year．

What's （55）　　（正确的） and wrong in the way we treat animals？