一篇关于宠物对人类有益还是有害的

Many people like to keep a kind of annimal as a pet ,such as dogs,cats,birds,and so on .They put so great enthusiasm on them that some pets are treated like their family members.
A good relationship between people and pets can be very comfortable.They are loyal audiences of you ,while you have something can't tell any one else.They occuppy the loneliness ,cure your pains,make anxious hearts return to peace and innocence ,some pets even can help to cure some mental disease.that's the advantages of keeping an pet.
However ,pets are often expensive,to feed them would even cost more .Too much money spend on pets are more or less a little improper while there are so many starving people in this nation.
Some dangerous pets are a menace to their owners ,even a dog attack people sometimes,things could be worse if they carrying some fatal virus.That's the disadvantages of keeping a pet.