2. 外语
  3. Complete the summary below. Choose NO MORE THAN THREE WORDS from the passage for each answer. Write your answers in boxe

Complete the summary below. Choose NO MORE THAN THREE WORDS from the passage for each answer. Write your answers in boxe

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问题     Complete the summary below.
    Choose NO MORE THAN THREE WORDS from the passage for each answer.
    Write your answers in boxes on your answer sheet.
    How the elephants sense these sound vibrations is still unknown, but O’Connell-Rodwell, a postdoctoral researcher at Stanford University, proposes that elephants are ’listening’ with their【R1】________by two kinds of nerve endings that respond to vibrations with both【R2】________frequency and slightly higher frequencies. O’Connell-Rodwell’s work is at the combination of geophysics, neurophysiology and【R3】________.
    It was known that seismic communication existed extensively within small animals, but O’Connell-Rodwell was the first person to indicate that a large land animal would send and receive【R4】________too. Also, he noticed the freezing behaviour by putting a male planthopper on a stem and play back a female call, which might prove the existence of other communicative approaches besides【R5】________.
    Scientists have determined that an elephant’s ability to communicate over long distances is essential, especially, when elephant herds are finding a【R6】________, or are warning of predators. Finally, the results of our 2002 study showed us that elephants could detect warning calls through the【R7】________.
【R6】
选项
答案mate
解析 科学家断定，象群在找什么或警示捕食者来袭时，远距离的沟通能力特别重要。根据顺序原则，继续阅读第5段之后的内容。第6段的开头提到大象远距离沟通的能力对于生存十分必要。紧接着便提到，大象在寻找配偶(mate)时比较困难，而大象独特的生殖学特征使之难上加难。题干后半句are warning of predators在文中被改写为send alerts regarding predators。因此，本题的答案为mate。
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