MRI可显示下列心脏结构,除了()
A.房室间隔
B.心肌壁厚度
C.心腔大小
D.人工生物瓣膜
E.金属瓣膜
参考答案:E
He often_______ tennis with his friends. Now they_______ tennis at school.
A.play; play
B.plays; playing
C.plays; are playing
D.playing; are playing