Waves of red light are about ________ as those of blue light．A.as twiceB.so twiceC.twice as longD.twice long
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C解析倍数的三种表达法：①倍数（three times）+as+adj．（adv．）+as+B ②倍数（three times） the size／the length／the width／the height+of+B ③倍数（three times）+adj比较级／adv．比较级+than+B如：The earth is 49 times the size of then moon．He has three times more money than I have．