学龄期儿童的首位死亡原因是()。
A.呼吸系统疾病
B.遗传病
C.意外死亡
D.传染病
E.消化系统疾病
参考答案:C
下列关于家鸽骨骼与飞行相适应的叙述,其中不正确的是( )
A.骨薄而轻
B.胸骨发达,有龙骨突
C.长骨大多中空
D.颈椎骨多而灵活
--- It seems that the manager is very unhappy.
--- Surely she is. You see, Steve left the company half an hour ago, with his work_______.
A.to leave unfinished
B.was left finishing
C.leaving to finish
D.left unfinished