婴儿手足搐搦症的主要死亡原因是（）
A.脑水肿
B.心力衰竭
C.吸入性肺炎
D.呼吸衰竭
E.喉痉挛
参考答案：E
John received an invitation to dinner, and with his work ____, he gladly accepted it.
A．finished
B．finishing
C．having finished
D．was finished
内燃机车上能起到缓和冲击和减振两种作用的弹簧是（）。
A、圆弹簧
B、板弹簧
C、橡胶弹簧
D、碟形弹簧
