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】________.
【R7】
选项
答案ground
解析 最后，2002年的研究结果说明，大象可以通过什么来探测警报声。通过题干关键词2002 study可以定位到第7段最后1句。其中原文outcomes对应题干results，revealed对应showed，sense对应detect，through重现。因此，本题的答案为ground。
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