【題目】(2017·北京改編) A machine with a specific purpose has another quality, one that we usually associate with living things: a wish to _____________(保存) its own existence.

【答案】preserve

【解析】句意：有特殊用途的機(jī)器有另一種品質(zhì)，一種我們通常與生物聯(lián)系到一起的東西，即一種保存自己存在的愿望。“to ____ its own existence”是動詞不定式作定語，修飾a wish，故該空填動詞原形preserve。

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