(单选题)

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A.deafness

B.depression

C.blindness

D.speechlessness

参考答案：C

参考解析：

考查名词词义辨析和上下文语境。句意：后来，他在非洲工作，那里的许多人因为缺乏适当的治疗而失明。deafness意为“聋”；depression意为“沮丧”；blindness意为“瞎”；speechlessness意为“哑口无言”。根据下文的“And tens of millions in Africa and Asia can see because of the ______ Wilson made to preventing the ______”可知，很多人因为Wilson的努力而复明。可推知，在非洲，有很多人因为缺乏适当的治疗而失明。故选C。

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