严重肺气肿时( )
A.胸廓前后径与左有径比例缩小B.胸廓扁平C.胸廓前后径与左右径比例增大D.肋间隙变窄E.腹上角缩小
参考答案:C
----Whose is that book?
----It _________ belong to Lucy. Her name is on it.
A.must
B.mustn't
C.might
D.can't
相反理论的要点是,在市场投资者爆满的时候出场,在投资者稀少的时候进场。 ( )