Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the correct order to form a meaningful and coherent paragraph.
A. There are hundreds of acupuncture points on the body.
B. Acupuncture, a system of treatment of disease, has been practiced in China for nearly five thousand years.
C. It consists of the rapid insertion of steel needles, about six centimeters long, in particular spots on the body of the patient.
D. After inserting the needles, the doctor twirls it between his thumb and forefinger.