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海豚定位海豚的文章不同,大意差不多,讨论海豚声音定位如何避免跟别的声音混淆
P1海豚利用click和emission來航海,並且能夠區分船隻的噪音,海底其他動物的聲音,同伴的聲音。比如一種蝦,發出的聲音很像是海豚發出的,人類一般不能區別出。[此處有題,答案是海豚對各種聲音的辨別力比人類強。]
P2第二段開始講述海豚具體的辨別聲音的過程,比較複雜,大概是收到聲音後再自己發出聲音,然後通過回音等等來分辨。此處講到海豚的emission是有規律的頻率變化。[有題,問 emission的性質。答案是頻率改變,但是有規律可循,可以預測。]
P1 use acoustical method in a noisy environment.
P2 talk about why they can avoid the noise. Basically only focus on how the acoustics works. Detect clicks by repeat rate, change of frequency is not in a fixedpattern. Whistle frequency change in a consistent pattern
Q1: TOPIC. D, E is close in the words used. But E is correct.
D: present information about a problematicissue in environment of particular animal.
E: explain the method used for a problematic issue in particular environment. Q2. what is correct about whistle and clicks.
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