18．-This history book is of great value．
-Exactly．However，______can enjoy it ____ they have a deep understanding of it．（　�。�
A．Something； untilB．Few； unless
C．Nothing； unlessD．Little； since

分析 --這本歷史書很有價(jià)值．
--確實(shí)是，然而，沒(méi)有人能享受它除非他們有深刻的理解．

解答 答案：C．
something意思是"某事，某物"；anything意思是"任何事物"；few意思是"一點(diǎn)"；little意思是"一點(diǎn)"；until意思是"直到…才…"；unless意思是"如果不"相當(dāng)于if…not…通過(guò)發(fā)現(xiàn)句子結(jié)構(gòu)可知，句子中含有一個(gè)關(guān)鍵詞however，意思是"然而"表示轉(zhuǎn)折，因此可知這句話的意思是"沒(méi)有人能享受它除非他們有深刻的理解"，綜上所述，故選C．

點(diǎn)評(píng) 首先要掌握句子的意思，還要掌握這幾個(gè)不定代詞和連詞的意思，然后結(jié)合具體的題目，就可以確定正確答案．

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