考点规范练24(必修4　Module 6)

　　　考点规范练第48页　 

　　.阅读理解

　　A

　　Can you smell two things at once?This experiment comes from the research of two scientists from Rice University.Denise Chen and Wen Zhou have been experimenting with the science of smell,and have made some very interesting discoveries.

　　To explore that,you will need two things with strong,characteristic smells and,of course,your nose.The idea is to smell a different smell with each nostril.Hold one smell very close to your right nostril,and the other smell very close to your left nostril.Then breathe in and pay close attention to what you smell.

　　What you should find is that one smell will be very strong.After another sniff or two,the first smell will go away,and you will smell the other smell.Keep sniffing,and the first smell will come back.Instead of smelling the two smells evenly mixed,they will work in turns,one after the other.

　　Why?Chen and Zhou found that your sense of smell acts much like your sense of sight.Hold a book in front of your nose,so that your left eye sees things on the left side of the book,and your right eye sees things on the right side of the book.You will find that your sight works in turns,first on the left side of the book and then on the right side.Notice that you can’t focus your left eye on one object while focusing your right eye on another object.Your brain jumps back and forth,paying attention to one and then the other.The same thing happens with your nostrils.If they are smelling different smells,your brain pays attention to one and then the other.

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