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

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问题     Complete the summary below.
    Choose NO MORE THAN TWO WORDS from the passage for each answer.
    Write your answers in boxes on your answer sheet.
                                                Aestivation
    In many places inhabited by crocodilians, most types of crocodiles have evolved a successful scheme to survive in the drought brought by a【R1】________.
    According to Kennett and Christian’s six-year study of Australian freshwater crocodiles’ aestivation, they found aestivating crocodiles spent around【R2】________of the year and had no access to【R3】________. The amount of water in the body declined proportionately with【R4】________; thus there is no sign of【R5】________and other health-damaging impact on the crocodiles even after an aestivation period. This super capacity helps crocodiles endure the tough drought without slowing their speed of【R6】________.
【R4】

选项

答案body weight

解析 体内的水含量与什么成比例减少。原文G段开头提及了鳄鱼会消耗自身的水分(water reserves)和脂肪,继续往后扫读,第4句再次提到水分,proportional替换了题干proportionately,与水分一词并列的名词成分应为答案。因此,本题的答案为body weight。
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