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

    A.thatB.theseC.thoseD.it

    【答案】C

    【解析】

    考查代词。句意：红光波大约是蓝光波的两倍长。此处是倍数表达，指代比较对象时，单数用that，复数用those。句中比较对象是waves of red light和waves of blue light，waves是名词复数，应该用those代替，故选C。

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