肌肉收缩时其长度不变张力改变称为（）
A.等长收缩
B.等张收缩
C.动力性收缩
D.等动收缩
E.向心性收缩
参考答案：A
Frank made a good_______ _on the first interview, so the manager gave him the job.
A．expression
B．impression
C．influence
D．explanation
既属于消化系统又属于呼吸系统的器官是
A．小肠
B．胃
C．喉
D．咽
