托福practice test 4阅读Look at the four squares [■] that indicate where the following sentence could beadded to the passa答案解析【小站备考】

Sleep patterns vary considerably among different animal species. Some animals, like dolphins, have unique sleep methods. Dolphins practice unihemispheric slow-wave sleep, meaning one half of their brain sleeps while the other remains awake. This adaptation allows them to surface for air and stay alert for predators even while resting.

Birds also display interesting sleep behaviors. Many bird species can sleep while flying. [■] During long migratory flights, some birds may engage in unihemispheric sleep, similar to dolphins, enabling them to navigate and avoid threats. [■] Additionally, certain birds can sleep with both hemispheres of their brain but in short bursts, allowing them to maintain continuous flight for extended periods.

[■]Sleep patterns have evolved based on environmental needs. For example grazing animals like cows and horses sleep minimally, often standing up, which helps them stay vigilant against predators. [■] In contrast predators such as lions and tigers can afford longer, deeper sleep because they face fewer threats. Understanding these varied sleep patterns provides insight into how animals have adapted to their habitats and survival challenges. The balance between rest and vigilance is crucial for survival, revealing the intricate adaptations across the animal kingdom.

PRACTICE TEST 4 Look at the four squares [■] that indicate where the following sentence could beadded to the passage. Where would the sentence best fit? Click on a square [■] to add the sentence to the passage. To select a differentlocation, click on a different square.

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