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

A．thoseB．that C．itD．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。在比較級中，指代比較對象時，單數(shù)用that，復(fù)數(shù)用those，這里的比較對象是waves，故選A。
考點：考查指示代詞

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