The law is expected to improve the efficacy of surveillance on HIV carriers.A、in

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问题 The law is expected to improve the efficacy of surveillance on HIV carriers.

选项 A、inspection
B、investigation
C、observation
D、restriction

答案 C

解析 C项observation“监视，观察”。A项inspection“检查，视察”。而划线词surveillance则是“监督、检查”的意思，与“检查、巡视”有些细微的差别；B项investigation“调查，研究”；D项restriction“限制，约束”。

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