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

分析 腦指紋或許在將來(lái)會(huì)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(gè)名詞，和冠詞an一起作主語(yǔ)的補(bǔ)語(yǔ)；根據(jù)漢語(yǔ)提示可知答案為alternative．

點(diǎn)評(píng) 首字母填空題考查的是詞匯的記憶和運(yùn)用能力，平時(shí)要注意積累和運(yùn)用．同時(shí)還要注意提示字母．

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