17．Schools in the south tend to be better equipped，______ those in the north are relatively poor．（　�。�
A．whileB．sinceC．whenD．as

分析 南方的學(xué)校往往有更好的裝備，然而北方的學(xué)校則相對較差．

解答 答案A．
while作并列連詞用，意思為"而，然而"，表前后意義上的對比或轉(zhuǎn)折．since意思是"自從…以來"時，引導(dǎo)時間狀語從句；意思是"既然"時，引導(dǎo)原因狀語從句．when"在…時候"，引導(dǎo)時間狀語從句．a(chǎn)s意思是"隨著"時，引導(dǎo)時間狀語從句；意思是"因?yàn)?時，引導(dǎo)原因狀語從句；意思是"盡管，雖然"時，引導(dǎo)讓步狀語從句．分析可知前后兩句話之間是邏輯上的"轉(zhuǎn)折"關(guān)系，再聯(lián)系句子表達(dá)的意思可知答案選A．

點(diǎn)評 本題考查并列連詞的用法．并列連詞用來連接平行的詞、詞組和分句．如：and，but，or，nor，so，therefore，yet，however，for，hence，as well as，both…and，not only…but also，either…or，neither…nor，（and）then 等．常用來表示轉(zhuǎn)折關(guān)系的并列連詞有如下幾個：but 但是；yet 然而；still 仍然；while 然而．

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