5．You'd better take down all the key points         the memory is still fresh in your mind．（　�。�
A．unlessB．whileC．beforeD．until

分析 當(dāng)記憶猶新的時候，你最好把所有的要點記下來．

解答 答案B．unless"除非，如果不"，在意義上相當(dāng)于if…not，因此在有些場合中unless與if…not可互換使用，引導(dǎo)條件狀語從句．while表示"當(dāng)…的時候"，引導(dǎo)時間狀語從句；意為"盡管、雖然"，引導(dǎo)讓步狀語從句；意為"而、但是"，引導(dǎo)比較狀語從句．before"在…之前"，引導(dǎo)時間狀語從句．until"直到"，引導(dǎo)時間狀語從句．分析可知前后兩句話是邏輯上的"時間"關(guān)系，可排除A項．"把所有的要點記下來"和"記憶猶新"中的動作同時或者幾乎同時發(fā)生，故排除C項．如果選用until，句子的意思不通順，可排除D項，故答案選B．

點評 本題考查從屬連詞的用法．連詞的用法辨析，要注意分析主從句之間的邏輯關(guān)系，再確定相應(yīng)的連詞，同時注意不同的連詞的語義及用法區(qū)別．

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