How do the researchers conduct the study？ 查看材料A.By
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How do the researchers conduct the study？ 查看材料
A.By studying the data got from the survivors who had experienced atomic radiation.
B.By carrying out the experiments in the lab.
C.By studying the features of the experiments.
D.By studying the features of the erperiments.
请帮忙给出正确答案和分析，谢谢！
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正确答案：正确A
【答案】A【解析】根据第三段内容“researchershavehadtOestimatepubfichealththreatsfromradonbyguessfromtheeffectsofhigherdosesofalpharadiation．SuchdatacomesprimarilyfromstudiesofsurvivorsoftheatomicbombsthatdestroyedHiroshimaandNagasakiinJapan．”可知，研究者们不得不通过猜测a粒子的高剂量来估计氡对公众健康的威胁，这些数据主要来自对遭受破坏日本广岛和长崎的原子弹的受害者的研究，所以选A。