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Directions: After reading the passage below, fill in each blank with a proper word given in the box. Each word can be used only once. Note that there is one more word than you need.
A. appearances B. imitating C. distinguish D. isolate E. advantageous F. diverse
G. identical H. criterion I. markings J. poisonous K. threatening

Why different species start looking exactly the same

Is it better to stand out from the crowd or be similar to the background? For birds, the answer is complicated. While peacocks(孔雀) show off their brightly colored feathers to attract mates and ward off predators(捕食者), other birds find it 【小题1】 to hide themselves by imitating the looks of other birds.

Groups of birds flying together often come from the same species, making it hard to 【小题2】 one from another. However, some groups of birds including two or more species take on similar 【小题3】, which is an uncommon phenomenon. “They all share random features, like feathers on head or yellow bellies(腹部), which makes them almost 【小题4】. You can’t really tell them apart without looking at their 【小题5】.” says Scott Robinson, a famous scholar. His new study suggests 【小题6】 another bird’s appearance is not a coincidence(巧合) but rather an evolutionary method to increase their chances of survival. Looking like a bird from a dominant species helps reduce attack from other members and appear more 【小题7】 to potential predators.

“In imitation, you often want to look like something because there’s an advantage to being that other thing. You want species to think you’re 【小题8】 or low-profitable target.” says Rebecca Kimball, a professor of biology. “In grouping birds, one idea is that this has more to do with a predator’s ability to 【小题9】 a target. When there are a group of birds moving around, it may be easier for predators to identify an individual that has a distinct color pattern.”

While it may not seem like it at first, imitating other birds is helping to create more 【小题10】 species. Not only do birds imitate more than one species as they grow up, but their appearance varies over time.

22-23高二下·上海嘉定·期末
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