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Waves of red light are about twice as lo...

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

A.that B.these C.those D.it

 

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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