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CYou've never seen a passenger pigeon (鸽子). But not too long ago, millions of themfilled the skies. Suddenly, the bright noonday sky turms black, and the sound of millions offlapping (拍打） wings fills the air. The cloud of birds passes on, and on, and on, and youoverhead. Yet now, they are extinct.Passenger pigeons, which once lived in the woodlands of eastern North America, were themost common bird in the world.But in 1914, the last bird died in a Cincinnati zoo.Her bodywas stuffed and put on display,so visitors could see what she had looked like.The billion-bird groups of passenger pigeons needed huge areas of wild forest to nest in,and to find nuts to eat. When European settlers arrived with guns, they couldn't believe theirluck. Pigeon was a popular food at that time. And here were whole forests full of dinner! Pigeonhunters destroyed the trees, shooting all the pigeons they could. Sometimes people shotpassenger pigeons just for fun, to see who could get the most.Like all pigeons, passenger pigeons were social birds. They liked to hang out together intrees and fly together in big groups. They were also friendly and not afraid of humans.Unfortunately, this made them easy to hunt.The pigeons' forest homes were disappearing, too. As more people moved west, they cutdown trees for wood and to make room for farms. By the late 1800s, the birds were in trouble.Female passenger pigeons laid just one egg per year. So not enough babies were born to take theplace of all the birds beingkilled.Extinction is a part of the cycle of nature. When conditions change, species must adapt tosurvive.Some evolve (进化） into new species. Some that don't adapt will die off They goextinct. Species can go-extinct when some sudden disaster happens, like the asteroid strike thatwiped out the dinosaurs.28.Why did European settlers hunt passenger pigeons?A. For food and fun.B. For wood and food.C. For sport and money.D.For farms and power29. What made passenger pigeons easy to hunt?A. Their flying way.B. Their large groups.C. Their love for nuts.D. Their social nature.30. What does the text mainly talk about?A. Where the passenger pigeon has gone.B. Why the passenger pigeon went extinct.C. How humans conserve the passenger pigeon.D. What the life of the passenger pigeon is like.31.What's the structure of the text?A. Cause-effect.B. Definition-example.C. Problem-solution. D. Comparison-contrast.高一英语第5页（共10页）（2025.7)