Question

Waves of red light are about ________ as those of blue light．

1. A.
   as twice
2. B.
   so twice
3. C.
   twice as long
4. D.
   twice long

Answer 1

C
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．