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Waves of red light are about twice as long as _______ of blue light.
A．thoseB．that C．itD．Ones
A

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(shí)，單數(shù)用that，復(fù)數(shù)用those，這里的比較對象是waves，故選A。
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