It has been proved that the chemical is lethal to rats but safe for cattle.

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问题 It has been proved that the chemical is lethal to rats but safe for cattle.

选项 A、fatal
B、reactive
C、unique
D、vital

答案A

解析句意：经证实这种化学药品对老鼠来说是致命的，而对牛来说却是安全的。lethal和fatal的意思都是“致命的”。reactive反应的，起反作用的。unique唯一的，独特的。vi—tal生死攸关的，重大的。

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医学博士外语

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