—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

心包积液的表现有（）

A.脉压大

B.奇脉

C.ECG肢导联低电压

D.心音弱

E.心界向两侧扩大