She found ____ very difficult _____ English.

A．it; to learn

B．herself; learning

C．it; to learn from

D．that; to learn

破伤风最先受影响的肌群是（）。

A.咀嚼肌

B.面部表情肌

C.颈肌、背肌、腹肌

D.四肢肌

E.膈肌