Waves of red light are about twice as long as _______ of blue light.

A. those B. that C. it D. Ones

 

A

【解析】

試題分析：考查指示代詞。句意：紅光的波長是藍(lán)光波長的兩倍長。在比較級(jí)中，指代比較對(duì)象時(shí)，單數(shù)用that，復(fù)數(shù)用those，這里的比較對(duì)象是waves，故選A。

考點(diǎn)：考查指示代詞

 

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