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12．Eleven point two kilometers per second，______ satellites can be freed from the gravitation of the earth，is called"escape speed"．（　　）

A．

which

B．

when

C．

about which

D．

at which

分析每秒11.2千米是被稱之為"逃逸速度"，衛星就是以這種速度脫離地球的引力．

解答答案：D．本句含有非限制性定語從句，先行詞是表示速度的，從句中不缺少主語、賓語或者表語，所以用介詞+關系代詞的結構，在英語中表達"以…的速度"一般用介詞at，所以本題選擇D．

點評認真分析句子結構，弄清定語從句所修飾的先行詞，先行詞所表達的范疇，然后分析從句中的成分，最終確定用什么關系詞．

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