- 单选题Doctor Smith was one of the（）in cancer research.
- A 、pioneers
- B 、advocates
- C 、engineers
- D 、founders
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参考答案【正确答案：A】
pioneer意思是“开拓者，先驱者”。译：史密斯博士是研究癌症的开拓者之一。advocate提倡者，拥护者；engineer工程师；founder创始人。
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