18．The entry point tissue in the very front of eye functions as the window_________all light has to pass on its way．（　�。�
A．whichB．thatC．across whichD．through which

分析 眼睛里最前端的入口點(diǎn)的組織的功能就像窗戶一樣，所有光線在傳進(jìn)眼睛的過程中一定要通過它．

解答 答案是D．本題考查定語從句中關(guān)系詞的選擇；題干中空格后面是以the window 為先行詞的定語從句；把the window 帶入到定語從句，從句完整的表達(dá)為"all light has to pass through the window on its way．"，可見先行詞前需要介詞through，故答案是D．

點(diǎn)評 選擇定語從句中的關(guān)系詞，首先要理解各關(guān)系詞的用法；然后找準(zhǔn)先行詞，將先行詞帶入到定語從句；最后根據(jù)先行詞在定語從句中的作用判斷關(guān)系詞．

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