妊娠合并再生障碍性贫血对胎儿的影响哪项应除外（）

A.当孕妇重度贫血时可出现胎儿发育迟缓

B.当血红蛋白≤60g/L时可以导致流产

C.当孕妇重度贫血时可发生早产

D.当孕妇重度贫血时可发生死胎、死产

E.当孕妇重度贫血时可发生胎儿畸形

He lost both of his parents in the big earthquake, but       for him, a kind couple adopted him and took good care of him.

A．suddenly

B．naturally

C．obviously

D．luckily