Milk and bread ____ my favorite food every morning. [ ]
A. is
B. are
C. will be
D. was
答案:A
若一个人的肋间肌和膈肌皆因病而不能收缩,你认为此患者[ ]
A.肺仍能扩张和回缩
B.呼吸运动加快加强
C.肺活量减小
D.呼吸运动将停止
辅助性练习