17．Today，when scientists examine mummies，they wear special clothing for protection _____ they breathe in harmful gas．（　�。�
A．even thoughB．in caseC．untilD．unless

分析 今天，科學(xué)家們在檢查木乃伊的時候，他們穿著特殊的服裝作為保護以防他們吸入有害氣體．

解答 答案B．
even though"盡管，即使"，引導(dǎo)讓步狀語從句．in case"以防，以免，萬一"，引導(dǎo)條件狀語從句．until"直到"，引導(dǎo)時間狀語從句．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．分析可知前后兩句話之間是邏輯上的"條件"關(guān)系，再結(jié)合句子所表達的意思可知答案選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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