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

试题分析:考查指示代词。句意:红光的波长是蓝光波长的两倍长。在比较级中,指代比较对象时,单数用that,复数用those,这里的比较对象是waves,故选A。
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