Which of the following signs and symptoms is classic for a patient with rheumatoid arthritis

A．Joint swelling, joint stiffness in the morning, and bilateral joint involvement.

B．Crepitus, development of Heberden's nodes, and anemia.

C．Pain on weight-bearing, rash, and low-grade fever.

D．Fatigue, leukopenia, and joint pain.

朱砂药材的主要成分是（）

A.硫酸钙

B.硫酸镁

C.硫化汞

D.硫化铁

E.硫化亚铁