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16．According to the UN report，some 844animals and plantshave disappeared（消失）in the last 500years．

分析根據聯合國報告，在過去500年中大約844中動物和植物已經消失．

解答 have disappeared 考查時態．根據句意：根據聯合國報告，在過去500年中大約844中動物和植物已經消失．in the last 500 years在過去的500年中，說的是過去發生到現在已經完成的事情，與現在完成時連用，所以答案填have disapppeared．

點評高考題目對時態的考查是重點，謂語動詞要與時間狀語保持一致，時態與時間是密不可分的，各種時態卻要受到時間和語言環境的限制，根據題干提供的時間或者時間狀語體現的時間來判斷句子的時態是最直接的解題方法，扎實的語法功底加上準確的理解至關重要．

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