类风湿关节炎患者滑膜液中常检出的类风湿因子是（）

A.同IgG轻链发生反应的IgM

B.同IgG重链发生反应的IgM

C.同细菌抗原发生反应的IgE

D.同胶原蛋白发生反应的Ig

E.同DNA发生反应的IgG

The theory of language underlying Audiolingualism was derived from ______ in the 1930s and the 1940s in America.

A. behaviourist linguistics


B. functional linguistics
C. structural linguistics


D. transformational generative linguistics