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18．Teenagers have reached a point in their life _______ they are supposed to make decisions of their own for the first time．（　　）

A．

which

B．

where

C．

how

D．

why

分析青少年已經來到了他們人生的一個關鍵點，他們要第一次作出他們自己的決定了．

解答答案：B
題干中they are supposed to make decisions of their own for the first time修飾名詞point，是一個定語從句；從句結構完整，要用關系副詞；先行詞point表示抽象地點，要用where來引導．故選B．

點評定語從句是用來修飾名詞的形容詞性從句，相當于一個形容詞．連接定語從句的引導詞分為關系代詞和關系副詞，關系代詞在從句中要作主語或賓語；關系副詞在從句中作狀語．這也是選擇關系詞的一個判斷方法．

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