Everyone faces challenges(挑战)in their life.
Daniel Kish had serious problems with his eyes when he was born. And doctors took away both of his eyes before he was fourteen months old. Soon after, however, he started to do an amazing thing. He started to make clicking(咔塔)sounds with his tongue to help him move around. Much like a bat(蝙幅), he now moves about using sonar(声呐). He is so good at it that he can ride a bicycle in traffic.
He and his group, World Access for the Blind, teach others how to use sonar. In this interview with National Geographic, Kish explains how the process works.
How does sonar work?
“When I make a clicking sound, it makes sound waves. These waves reflect(反射)off surfaces all around and return to my ears. My brain then processes the sounds into images. It’s like having a conversation with the environment. ”
When you click, what do you see in your mind?
“Each click is like a camera flash. I make a 3D image of the things around me for hundreds of feet in every direction. ”
What is it like riding a bike using sonar?
“It’s exciting and enjoyable but needs a lot of focus. I click up to two times per second, much more than I usually do. ”
Is it dangerous to move around the world in this way?
“Most people live in fear of things that they imagine. I have a habit of climbing anything and everything, but I never broke a bone(骨头)as a kid. ”
How challenging is it to teach people to use sonar?
“Many students are surprised at how quickly results come. Seeing isn’t in the eyes. It’s in the mind. ”
1.Kish now moves around with the help of ________.
A.his tongue | B.sonar | C.eyes | D.a bat |
2.How does sonar work? Choose the right order.
a. The sound waves reflect off surfaces.
b. The person makes a clicking sound.
c. The brain makes images with the sounds.
d. The sound waves reach the persons ears.
A.b﹣a﹣c﹣d | B.b﹣d﹣a﹣c | C.a﹣b﹣d﹣c | D.b﹣a﹣d﹣c |
3.Which of the following is not true when Kish rides a bike using sonar?
A.Kish needs to pay attention. | B.Kish feels excited. |
C.Kish finds it enjoyable. | D.Kish clicks as usual. |
4.What can we know about Kish from the passage?
A.He always challenges himself bravely. | B.He lives in fear of things that he imagines. |
C.He became blind when he was 14 years old. | D.He broke his bone when climbing as a child. |
5.What would be the best title for the passage?
A.How Sonar Works | B.Riding a Bike Using Sonar |
C.Seeing with the Mind | D.How the Blind Move Around |