蚯蚓的运动方式是蠕动，身体变细长时肌肉的活动状况是[ ]

A．环形肌肉收缩，纵行肌肉舒张    

B．纵行肌肉收缩，环形肌肉舒张  

C．环形肌肉和纵行肌肉都收缩    

D．环形肌肉和纵行肌肉都舒张

A person ________ with H7N9 viruses will be more likely to die of lung dysfunction.

A．developed

B．infected

C．injected

D．progressed