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MOCK TEST 6 The word "physiological", in the passage is closest in meaning to

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Migratory Birds

Migratory birds are known for their long journeys between breeding and wintering grounds. These migrations can span thousands of miles and involve crossing continents and oceans. The ability of these birds to navigate such immense distances is one of nature’s most fascinating phenomena. Scientists have discovered that migratory birds use various methods for navigation, including the position of the Sun, the stars, and Earth’s magnetic field.

During migration, birds have to cope with numerous challenges, such as finding food and avoiding predators. To sustain themselves, many birds undergo physiological changes before embarking on their journey. They accumulate fat reserves, which provide the necessary energy for long flights. Some species also reduce the size of their digestive organs to minimize weight and maximize flight efficiency. These adaptations are crucial for their survival.

Recent research has shown that some migratory birds also possess in their eyes a specialized protein called cryptochrome, which helps them detect magnetic fields. This ability allows them to determine latitude—essentially how far north or south they are. Despite these remarkable adaptations, migratory birds face increasing threats from habitat loss and climate change, which can disrupt their migratory routes and reduce their chances of survival.

1.The word "physiological", in the passage is closest in meaning to

A. extreme

B. bodily

C. surprising

D. mental

你的答案：

正确答案：B

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题目解析：

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题干题型分析：词汇题，考查 “physiological” 的近义词。定位理解：定位第二段 “many birds undergo physiological changes before embarking on their journey”，后文举例 “accumulate fat reserves”“reduce the size of their digestive organs”，均为鸟类身体层面的变化。选项辨析： A（极端的）、C（令人惊讶的）不符合语境； D（精神的）与身体变化的例子相反； B（身体的）与原文描述的身体机能调整完全匹配，正确。

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