Wind power is an ancient source of energy        we may return in the near future.

A．on whichB．by whichC．to whichD．from which

C

解析試題分析：句意：風(fēng)力是古老的能源，我們不久的將來也許會再次回到風(fēng)力上來。Return to回到，返回；這里which引導(dǎo)的是定語從句，它代替source of energy，故選C。
考點：考查定語從句的用法。
點評：本題難度適中。定語從句是英語語法中非常重要的內(nèi)容，在閱讀和理解過程中起著極其重要的作用。定語從句的考查關(guān)鍵在于定語從句的成分分析，需要考生有分析理解復(fù)雜的句子結(jié)構(gòu)的能力。
即學(xué)即練： Tom has made great progress,        made us happy.
A. which         B. by which          C. when          D. that
解析：A。句意：湯姆取得了很大的進步，這使我們很高興。

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