单选题
The passage tells us that researchers wish that they could find out ______.
A、
when and where the veterans received the nuclear radiation
B、
why the amount of radiation cannot be accurately measured
C、
who was responsible for the veterans' deaths
D、
how much radiation each veteran got during the nuclear tests
【正确答案】
C
【答案解析】
[解析] 综观全文，c项为正确答案。
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