腹式呼吸的主动肌是()
A.腹直肌
B.腹外斜肌
C.膈肌
D.肋间肌
E.胸大肌
参考答案:C
He likes watching TV, ______ he doesn’t like playing sports.[ ]
A. and
B. or
C. so
D. but
论述汇编的要求及具体做法。