16．Schools in the cities are well equipped        those in the countryside are poor．（　　）
A．ifB．whileC．soD．as

分析 城市里的學(xué)校都配備地很好，然而鄉(xiāng)村的學(xué)校卻配備地很差．

解答 答案B．
if從屬連詞，意思是"如果"，引導(dǎo)條件狀語(yǔ)從句；while作并列連詞時(shí)，意思為"而，然而"，表對(duì)比；so是表示因果關(guān)系的并列連詞，意思是"因此"；as從屬連詞，作"因?yàn)?時(shí)，引導(dǎo)原因狀語(yǔ)從句，作"隨著"時(shí)，引導(dǎo)時(shí)間狀語(yǔ)從句．根據(jù)上下文語(yǔ)境"Schools in the cities are well equipped"和"those in the countryside are poor"可知是城市里的學(xué)校的裝備情況和鄉(xiāng)村的學(xué)校裝備情況的比較，故答案選B．

點(diǎn)評(píng) 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關(guān)系，再確定相應(yīng)的連詞，同時(shí)注意不同的連詞的語(yǔ)義及用法區(qū)別．While作并列連詞用，意思為"而，然而"，表對(duì)比．而but表轉(zhuǎn)折．
注意用心比較體會(huì)while與but的句中用意．
1．Some people waste food while others haven't enough．有些人很費(fèi)糧食，然而有些人卻吃不飽．  
2．The son was having a good meal at home，while the parents were working in the fields．兒子在家吃好飯而父母卻在田里辛勤勞作．  
3．I ought to have helped her，but I never could．我本該幫她但沒(méi)能．  
4．Honey is sweet，but the bee stings．蜂蜜很甜，但蜜蜂有刺蜇人．

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