【名词&注释】
毛泽东(mao tse-tung)、肘关节(elbow joint)、睫状体(ciliary body)、颈静脉(jugular vein)、共产党人(communists)、血清钠离子(serum na + level)、钠离子浓度(sodium ion concentration)、不明显(not obvious)、感光细胞层(photoreceptor layer)、节细胞层(ganglion cell layer)
[单选题]__________
根据以下内容,回答下面的题目。The death of a child, _51_ one’s own child,is something the mind can hardly comprehend.It seems togo _52_ nature.The end of a life that is still forming_53_ has just begun is an almost unthinkable cruelty.But it happens.Parents sometimes must witness the illness and death of the children_54_ whom they gave birth.And _55_ will ever fill theempty place that the dead child leaves behind.Parents_56_ to die before their children, which is the natural order of life events.When the situation is reversed and a child dies _57_ the parents itseems wrong.Yet we never know why one person dies andanother lives.But we do know _58_ a child is gone, theparents still have a future, as grey and worthless as it may at first seem.Death may take the child, but the love never _59_.The sorrow after a child’s death is one ofthe longest and hardest type of _60_ to live with.And ittakes long to deal with the parents’ own emotions.__________
A. and
B. or
C. but
D. so