问题
单项选择题
听觉理论中，基底膜整体振动时不同的部位最敏感的振动频率不同，因而在不同的频率声波中，耳蜗基底膜上不同位置具有不同的作用所表述的是以下哪一理论（）
A.共振理论
B.位置理论
C.频率理论
D.行波理论
答案
参考答案：B
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听觉理论中，基底膜整体振动时不同的部位最敏感的振动频率不同，因而在不同的频率声波中，耳蜗基底膜上不同位置具有不同的作用所表述的是以下哪一理论（）
A.共振理论
B.位置理论
C.频率理论
D.行波理论
参考答案：B
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| The Pecan Thief When I was six years old, I was visiting my grandfather's farm in Kansas. Grandpa had sent me into the __1__ to gather pecans for us to enjoy later. Pecan picking was really __2__ work and my little basket was only half full. I wasn't about to __3__ Grandpa down. Just then something caught my __4__. A large brown squirrel was a few feet away. I watched as he picked up a pecan, hurried to a tree and __5__ in a large hole in the trunk. A moment later the squirrel __6__ out and climbed down to the ground to pick up another nut. Once again, he took the pecan back to his hiding place. Not so __7__ anymore, I thought. I dashed over to the tree and looked into the hole. It was __8__ with pecans! Golden pecans were right there for taking. This was my __9__. Handful by handful, I scooped all of those pecans into my basket. Now it was full! I was so __10__ of myself. I couldn't wait to show Grandpa all the pecans. __11__, I ran back and shouted, "Look at all the pecans!" He looked into the basket and said, "Well, well, how did you find so many?" I told him how I'd __12__ the squirrel and taken the pecans from his hiding place. Grandpa congratulated me on how smart I'd been in observing the squirrel and his habits. Then he did something that __13__ me. He handed the basket back to me and put his arm gently __14__ my shoulders. "That squirrel worked very hard to gather his winter __15__ of food," he said. "Now that all of his pecans are gone, don't you think that little squirrel will __16__ the cold winter?" "I didn't think about that," I said. "I know," Grandpa said. "But a good man should never take __27__ of someone else's hard work." Suddenly I felt a bit __18__. The image of the starving squirrel wouldn't __19__ my mind. There was only one thing I could do. I carried the basket back to the tree and poured all the nuts into the hole. I didn't eat any pecans that night, but I had something much more filling-the __20__ of knowing I had done just the right thing. | |||
| ( )1.A.rooms ( )2.A.hard ( )3.A.let ( )4.A.sweater ( )5.A.joined ( )6.A.jumped ( )7.A.strange ( )8.A.covered ( )9.A.time ( )10.A.afraid ( )11.A.Otherwise ( )12.A.driven ( )13.A.annoyed ( )14.A.off ( )15.A.supply ( )16.A.escape ( )17.A.place ( )18.A.guilty ( )19.A.open ( )20.A.inspiration | B. woods B. dirty B. settle B. basket B. lived B. held B. secret B. filled B. choice B. ashamed B. However B. followed B. satisfie B. beside B. cost B. spend B. notice B. unconfident B. leave B. expectation | C. holes C. light C. have C. eye C. discovered C. stood C. anxious C. rebuilt C. chance C. careful C. Besides C. protected C. surprised C. over C. support C. survive C. advantage C. embarrassed C. cross C. impression | D. roads D. easy D. keep D. hand D. disappeared D. found D. patient D. decorated D. achievement D. Proud D. Therefore D. caught D. delighted D. around D. preparation D. flee D. charge D. nervous D. occupy D. satisfaction |