题型:阅读理解 题类:常考题 难易度:普通
Archerfish(射水鱼), a species famous for spitting (吐) water to shoot insects out of the air, can recognize one human face from another.
In the laboratory, instead of shooting insects, the fish were taught to spit at pictures of human faces showed on a computer screen outside their aquarium. The fish were first introduced to two faces, and taught to spit at one of them in exchange for a food reward. The researchers then tested whether the fish would recognize and spit at the face they had learned from among 44 new ones. And they were right more than 80% of the time.
To the researchers' surprise, even when they did that with faces that were in black and white, the fish were still able to find the face they were trained to recognize.
Telling one human face from another is a surprisingly difficult task. As we all have two eyes above a nose and a mouth, doing so depends on recognizing some extremely small differences.
“It has been supposed that this task is so difficult that it can only be completed by higher animals, which have a large and complex brain,” said Newport, whose study was published in the journal Scientific Reports. “But the archerfish were able to do this without having a neocortex, the most recently developed part of the brain. In humans, the neocortex governs our sense and language.”
“Fish have a simpler brain than humans and they don't have the section of the brain that humans use for recognizing faces,” Newport said. “Even though, many fish show amazing visual (视力的) behaviors and therefore make the perfect subjects to test whether simple brains can complete complex tasks.”
You walk into the classroom, look at that white piece of paper in front of you and are told you've got an hour and a half to do it. That can make anyone nervous, but here is the guide to stay calm.
Get a good night's sleep the night before the test, and eat a healthy breakfast next day. {#blank#}1{#/blank#} If you're too tired, you won't remember what you learnt the night before.
Get to class a little earlier. If you get there early, you'll make sure to get your favorite seat. {#blank#}2{#/blank#}
Breathe. Before the test, breathe in through your nose deeply and slowly. {#blank#}3{#/blank#} Repeat this several times. If you experience a sudden panic during the test, perform the exercise again.
Skip questions if necessary. {#blank#}4{#/blank#} If you come across a difficult question, skip the question and move on. You can come back to it at the end of the test if you have time, and later questions may help you get the answer(s) to the one(s) you skipped.
{#blank#}5{#/blank#} Don't panic if you notice other students writing very quickly or handing in their tests early. Tell yourself it's just a test. Really, it is. No matter what happens, everything will be OK.
A. Avoid staying up the night before the exam. B. Act like you are the only person in the room. C. Don't spend too much time on any one question. D. If you believe you can do it, you will find you can! E. A little exercise will help you remain calm during any stressful situation. F. Then, hold your breath for 3-4 seconds and blow out slowly through your mouth. G. You'll not also feel more relaxed if you don't get there in time or worse yet, late. |
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