Researchers in Boston have found_________in the blood of cancer patients that do not appear in healthy.

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问题 Researchers in Boston have found_________in the blood of cancer patients that do not appear in healthy.

选项 A、features
B、textures
C、substances
D、materials

答案C

解析考查词义辨析。句意：波士顿的研究人员在癌症病人的血液中发现健康人身上没有的物质。A项，features特征；B项，textures纹路；C项，substances物质；D项，materials原料。

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