Cornwall Research Facility in Salem primarily focuses on lung cancer research ______ treatment.

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问题 Cornwall Research Facility in Salem primarily focuses on lung cancer research ______ treatment.

选项 A、so
B、nor
C、but
D、and

答案D

解析 rescarch和treatment在句中是并列关系，lung cancer research and treatment的意思是：肺癌研究和治疗。故本题正确答案是D。

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