2023-2024学年高二英语译林版（2020）寒假综合练习

Unit 1(1) 山.据 9 A relative of starfish doesn't have eyes,but can still see.That information comes from scientists who studied sea creatures in the coral reefs of the Caribbean and Gulf of Mexico. The researchers reported this month that the starfish's relative-called the red brittle star-is only the second creature known to be able to see without having eyes.This ability is called extraocular vision(眼外视觉).The other creature said to have extraocular vision is a kind of sea urchin. Brittle stars,with five arms extending from a central disk,are part of a group of sea life called echinoderms.They have a nervous system but no brain.The red brittle star measures up to about 35 centimeters wide,from the end of one arm to the other.It lives in bright and complex environments.Because of the possibility of being eaten by fish,the creature hides during daylight hours. The red brittle star possesses extraocular vision as a result of light-sensing cells,called photoreceptors.These photoreceptors cover its body and chromatophores,the cells responsible for coloring.During the daytime,the chromatophores narrow the field of light being detected,making each photoreceptor like the pixel()of a computer image.When combined with other pixels,the image becomes complete. The visual system doesn't work at night.Laboratory experiments suggested that the brittle stars have very simple vision.Placed in a circular environment,for example,they moved toward walls that were white with a black bar,suggestive of a daytime hiding place. Lauren Sumner-Rooney is a research fellow at the Oxford University Museum of Natural History. She led the study.She said,"It's such a different concept for us,as very visually driven animals,to imagine how an animal might see its habitat without eyes,but now we know of two examples." )1.What's researchers'new finding about the red brittle star? A.It is a relative of starfish. B.It lives in the coral reefs. C.It has a very rare ability. D.It is a sea creature. )2.What