2. 外语
  3. Not all sounds made by animals serve as language, and we have only to turn to that extraordinary discovery of echolocation (回声定位

Not all sounds made by animals serve as language, and we have only to turn to that extraordinary discovery of echolocation (回声定位

admin2023-03-20  43
问题     Not all sounds made by animals serve as language, and we have only to turn to that extraordinary discovery of echolocation (回声定位) in bats to see a case in which the voice plays a strictly practical role.
    To get a full appreciation of what this means we must turn first to some recent human inventions. Everyone knows that if he shouts near a wall or a mountainside, an echo will come back. The further off this solid obstacle, the longer time it will take for the return of the echo. A sound made by tapping on the main body of a ship will be reflected from the sea bottom, and by measuring the time interval between the taps and the receipt of the echoes the depth of the sea at that point can be calculated. So was born the echo-sounding equipment, now in general use in ships. Every solid object will reflect a sound, varying according to the size and nature of the object. A shoal of fish will do this. So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish. With experience, and with improved equipment, it is now possible not only to locate fish but to tell if it is herring, cod, or other well-known fish, by the pattern of its echo.
    A few years ago it was found that certain bats emit squeaks (吱吱声) and by receiving the echoes they could locate and steer clear of obstacles—or locate flying insects on which they feed. This echolocation in bats is often compared with radar, the principle of which is similar.
Which of the following statements can be inferred from the passage?
选项 A、Animals are more intelligent than humans.
B、Humans are more intelligent than animals.
C、Animals are often compared with human inventions.
D、Humans are often inspired by animals.
答案D
解析 推理判断题。文章先说动物的回音定位功能，再说到回声定位探测仪的发明，由此可见，是动物的某些能力启发了人类的创造，因此只有选项D可从文中推测。文章并没有从智力方面比较人类和动物，因此可以排除选项A和B；而文章也没有比较动物和人类发明之间的异同，因此可排除选项C。
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大学英语四级

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