20．Brain-print could probably be offered as an alternativeto fingerprint in the future．

分析 腦指紋或許在將來會成為（手）指紋的一種替代．

解答 答案：alternative．
根據(jù)句子的意思可知，本句需要一個名詞，和冠詞an一起作主語的補語；根據(jù)漢語提示可知答案為alternative．

點評 首字母填空題考查的是詞匯的記憶和運用能力，平時要注意積累和運用．同時還要注意提示字母．

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