—Mrs. Wang was sent to teach English in a poor mountain village last year.

—She said she would never forget some pleasant _______ while working there. [ ]

A. experiments

B. expressions

C. experiences

D. emotions

心肌酶中对诊断急性心肌梗死特异性最高的是

A．CK-MB及LDH₂

B．CK-MM及LDH₁

C．CK-MB及LDH₁

D．CK-MB及LDH₃

E．CPK-BB及LDH₁