6．Though your status is permanent，your identification card isvalid only for 20years and has to be renewed regularly．

分析 盡管你的身份是永久性的，但是你的身份證的有效期僅僅是20年，需要定期更換．

解答 答案是valid．考查單詞填空．主句是主系表結(jié)構(gòu)．題干表達(dá)的是"你的身份證的有效期僅僅是20年，需要定期更換"，所以用形容詞valid作表語，表示"有效的"．故答案是valid．

點(diǎn)評 解答此類題目，首先需要明確句意，然后根據(jù)相關(guān)語法填寫正確的答案．

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