人体形成尿液的部位是（　　）

⑴My father is practising English.____                A.

⑵I'm going to study Geography in middle school.____    B.

⑶He is going to ride his bike to school.____             C.

⑷My friend Sam is going back to the UK.____      D.

⑸It's time to have lunch.____                     E.

关于物体的重心，下列说法中正确的是（　　）

8004÷26=____......____