TAILIEUCHUNG - IELTS Academic Reading Sample 60 - Let’s Go Bats

Tài liệu tham khảo IELTS Academic Reading Sample 60 - Let’s Go Bats dành cho các bạn chuẩn bị bước vào kì thi quốc tế, tài liệu giúp các bạn nắm vững các kiến thức căn bản và có thêm nhiều kĩ năng khi làm bài để đạt được thành tích cao, đồng thời giúp ích cho bạn trong công việc tương lai. | Let s Go Bats A Bats have a problem how to find their way around in the dark they hunt at flight and cannot use light to help them find prey and avoid obstacles. You might say that this is a problem of their own making one that they could avoid simply by changing their habits and hunting by day. But the daytime economy is already heavily exploited by other creatures such as birds. Given that there is a living to be made at night and given that alternative day time trades are thoroughly occupied natural selection has_ favored bats that make a go of the night-hunting trade. It is probable that the nocturnal trades go way back in the ancestry of all mammals. In the time when the dinosaurs. dominated the daytime economy our mammalian ancestors probably only managed to survive at all because they found ways of scraping a living at night Only after the my stenos mass extinction of the dinosaurs about 65 million years ago were our ancestors able to emerge into the day light in any substantial numbers. B Bats have an engineering problem how to find their way and find their prey in the absence of light Bats are not the only creatures to face this difficulty today. Obviously the night-flying insects that they prey on must find their way about somehow. Deep-sea fish and whales have little or no light by day or by night. Fish and dolphins that live in extremely muddy water cannot see because although there is light it is obstructed and scattered by the dirt in the water Plenty quot of other modern animals make their living in conditions where seeing is difficult or impossible. C Given the questions of how to manoeuvre in the dark what solutions might an engineer consider The first one that might occur to him is to manufacture light to use a lantern or a searchlight Fireflies and some fish usually with the help of bacteria have the power to - manufacture their own light but the process seems to consume a large amount of energy. Fireflies use their light for attracting mates. .

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