内容正文:
课时作业(十) Unit 2 Natural disasters
一、阅读理解
(2022·湖南省长沙市雅礼中学高三模拟考试二)Sudan, the world’s last male northern white rhino(犀牛), died at 45 (elderly in rhino age) on Monday at Kenya’s Ol Pejeta Conservancy, about 130 kilometers north of Nairobi. The animal’s health had been in a bad state for the past month and recently worsened so much that he could no longer stand, so his treatment team decided to euthanize(使安乐死) him.
Born in Shambe, South Sudan, the rhino was captured two years after living in the wild and brought to the Dvur Kralove Zoo in the Czech Republic. He was moved to the Ol Pejeta Conservancy 34 years later.
This very special animal was beloved by many worldwide—and his death is a terrible warning of humanity’s threat to animals. Hunters in the 20th century wiped out most of this white rhino subspecies population, mainly for their horns, which were used in traditional health treatments. More than 2,000 of the animals lived in the wild in the 1960s, but their numbers had dropped to a couple of dozen by the end of the century. The only remaining northern white rhinos today are two captive(关在笼子里的) females—Sudan’s daughter Najin and granddaughter, Fatu. Neither is able to give birth naturally.
Now researchers are hoping to keep this kind of animal alive by artificially fertilizing Najin and Fatu’s eggs with sperm(精子) frozen from male northern white rhinos and then implanting the fertilized eggs into a female southern white rhino—a subspecies that was also threatened but has since grown quickly because of conservation efforts. Last year, as part of a campaign to raise money for such fertilization attempts, which experts say could cost as much as US $9 million, Sudan acquired a Tinder social medial account where people can donate money by swiping right on their phone screen. As of late Tuesday, the Ol Pejeta Conservancy had yet to update its website, which still read, “Visit the last three northern white rhinos”—a ticking alarm clock to which some humans are desperate