鸟类适于飞行生活的下列特点中，错误的是 [ ]
A．体呈流线型
B．胸肌发达
C．口内无齿，消化慢
D．体被羽毛，前肢为翼
C
纸质会计档案是指以（）为介质保存的会计档案。
A.纸
B.光盘
C.缩微胶片
D.磁盘
—I can't go with you. My mother is ill.
—_____.[ ]
A. Is it?
B. I'm sorry to hear that.
C. It's too bad.
D. That's wrong.
