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What evolutionary change in birds led to a nest’s building?
What evolutionary change in birds led to a nest’s building?
admin
2014-01-10
21
问题
What evolutionary change in birds led to a nest’s building?
Many egg-laying animals merely lay their eggs and leave. Turtles, for instance, and horseshoe crabs, the eggs are hatched and the little ones are on their own. The current theory about birds is the earliest birds did just that when they were cold-blooded creatures living in warm places. However, when they became warm-blooded creatures living in cold places, they had to remain on the eggs to keep them warm. For this, they needed a place—a nest. Very likely, the first nest was just a primitive hole scraped in the ground. Even now many species still lay eggs in this sort of crude nest. Primitive nests found on the ground were fine for some birds, but others began to elevate their nests in branches, perhaps to avoid predators. These early elevated nests were probably cup-shaped nest. This type is still built by some birds today. The latest development in nest, the most recent vision, so to speak, is the cup-shaped nest. This is the one we regard today as the typical bird’s nest, you know, like a robin’s nest.
选项
A、on the ground
B、in the cold places
C、on the highest branches of trees
答案
A
解析
文中提到the first nest was just a primitive hole scraped in the ground,故A项正确。
转载请注明原文地址:https://kaotiyun.com/show/JakK777K
本试题收录于:
D类竞赛(专科)题库大学生英语竞赛(NECCS)分类
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D类竞赛(专科)
大学生英语竞赛(NECCS)
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