12．Eleven point two kilometers per second，______ satellites can be freed from the gravitation of the earth，is called"escape speed"．（　�。�
A．whichB．whenC．about whichD．at which

分析 每秒11.2千米是被稱(chēng)之為"逃逸速度"，衛(wèi)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(yǔ)從句，先行詞是表示速度的，從句中不缺少主語(yǔ)、賓語(yǔ)或者表語(yǔ)，所以用介詞+關(guān)系代詞的結(jié)構(gòu)，在英語(yǔ)中表達(dá)"以…的速度"一般用介詞at，所以本題選擇D．

點(diǎn)評(píng) 認(rèn)真分析句子結(jié)構(gòu)，弄清定語(yǔ)從句所修飾的先行詞，先行詞所表達(dá)的范疇，然后分析從句中的成分，最終確定用什么關(guān)系詞．

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