Can Dogs See in Color?
      Lots of people think that dogs see in black and white. But this is not true. Scientists recently
discovered that dogs do see colors, just not quite the same colors that we do.
      When people see a rainbow, they see purple, blue, blue-green, green, yellow, orange, and red. But
when dogs see a rainbow, they see gray, blue, gray, yellow-brown, yellow, and yellow-brown. Can you
imagine?
      Dogs see red and green as a single color (yellow-brown) and also blue-green and purple as a single
color (gray). This means that if you buy your dog a bright red toy, it will see it as an ugly yellowish
brown.
      Why? Well, a human eye has three different types of cells that can detect color. Dog’s eyes,
however, have just two. This makes the range of colors that they can pick up much more limited. (翰林)
detect 檢測 cell 細胞 range 範圍 limited 有限 imagine 想像
39. What is the article about?
(A) How to treat dogs.
(B) How dogs see the world.
(C) What best feed your dog.
(D) Why exercise is important for dogs.