【題目】Waves of red light are about twice as long as of blue light.

A.thatB.theseC.thoseD.it

【答案】C

【解析】

考查代詞。句意：紅光波大約是藍光波的兩倍長。此處是倍數(shù)表達，指代比較對象時，單數(shù)用that，復數(shù)用those。句中比較對象是waves of red light和waves of blue light，waves是名詞復數(shù)，應該用those代替，故選C。

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