Some scientists claim that a cuttlefish’s eyes are incapable of

distinguishing between yellow and red, but cuttlefish can camou-

flage themselves by exactly matching the color scheme of their

surroundings, which often includes yellow or red or both.  Since

cuttlefish could not match the colors of their surroundings without

having some capacity to distinguish between those colors, the

scientists’  claim must be  wrong.

 Which of the following is an assumption on which the argument is

based?

     A  Yellow and red are the two most common colors in a cuttle-

       fish’s environment. 

     B　 Cuttlefish never change their color except to match their

       surroundings. 

    C　  There are never more than  two colors present in the sur-

       roundings of a cuttlefish.

   D　   Cuttlefish do not distinguish colors without using their eyes. 

    E  There are no colors that cuttlefish cannot match exactly. 

答案：D