14．Recently，a photo of a dress has got lots of people all over the world confused．When looking at the photo，some people see it as gold and white，while others see it as blue and black．
"Colors can look different to us，depending on what kind of light they're in，"said some scientists．"For example，something blue can look very different in sunlight，than under streelights at night-time．"
However，when are people seeing the same photo of the same dress in different colors？In fact，there are two different kinds of cells（細胞） in your eyes that allow the brain to see colors．When the light goes into your eyes，rods（視網(wǎng)膜桿）are more likely to feel light and are used to see shapes，but not color．Instead，cones（視錐）are less likely to feel light，but more to color．Both of them are part of retina（視網(wǎng)膜），which is at the back of your eyes．At the same time，the messages received by rods and cones are sent into your brain．Having more rods than cones is the cuase of color blindness．
Having more of one or the other will lead you to be likely to see the dress as white or gold，or blue and black-it all depends on how your brain decides to explain the color．Finally，when your brain decides how to do with the ambient light form all the directions on somehting，the types of cells in your eyes will help dicide．
To put the idea to the test，look at the dress on a page with a white background（背景）．Then stay in a dark room for half an hour，you'll look at the dress there on a black background．So what color do you see？
46．The underlined word"ambient"in the passage means"B"in Chinese．
A．流通的
B．周圍的
C．環(huán)境的
47．PictureA can show how the two different kinds of cell works in your eyes．
48．From the passage，we know that people feel confused aboutA
A．the color of the dress
B．the kind of light
C．the photo of the dress
49．Which of the following is TRUE according to the passage？C
A．The same color looks no different whether it's in the daytime or at night．
B．He or she will have trouble in color blindness when one's cones are more than rods．
C．Both of the two different kinds of cells on the retina can feel light．
50．What is the best title for this passage？B
A．The Same Dress in Different Colors
B．Two types of Cells in Your Eyes
C．A Discussion Caused by a Dress．
