Polymyositis is inflammation of many:
A.sense organs
B.muscles
C.glands
D.bones
The bone of the thigh is the:
A.patella
B.umbilicus
C.cranium
D.femur
Chondrosarcoma is a tumor that originates in:
A.adipose tissue
B.bone
C.cartilage
D.muscle
The frontier experience began in about 1890 and is still continuing in the American West today.
A. 对
B. 错