By the year 2025, the Earth could l

By the year 2025, the Earth could lose as many as one fifth of all species known to exist today. In recent centuries, hundreds of species have disappeared, almost always as a result of human activities. The passenger
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pigeon, one familiar example, was a source of food until excessive hunting and habitat loss caused its extinction in 1914. The North American bison, whose populations were decimated by settlers and market hunters in the 1800s, came close to sharing the same fate. Bison survive today only because of the efforts of early conservationists. Today, species require such efforts more urgently than ever. An essential task that falls to present-day conservationists is to determine which species are most, endangered, so that conservation resources' can be applied where action is needed most. Species are categorized by the degree to which their survival in the wild is threatened. World Wildlife Fund offers a sampling of animals and plants that fall mainly within the two most serious categories of- threat: critically endangered and endangered. What threatens these species' existence? Some of the top threats are habitat destruction by unsustainable logging and ever-encroaching human settlement; pollution of water, soil, and air by toxic chemicals; unnatural climate changes due to fossil fuel use; unmanaged fishing that exhausts fish stocks; and illegal hunting to supply the demand for skins, hides, traditional medicines, food, and tourist souvenirs. The list which conservationists presents only a fraction of the species at risk of extinction today and does not include thousands of species whose status we do not yet know. Hundreds of species without common names have been left out, which means that while many mammals are on this list, only a few insects and mollusks are included. Species listed here range from the largest animal on Earth, the blue whale, to the majestic tiger, to the humble thick-shell pond snail. Large or small, beautiful or ugly, all species play a role in the complex circle of life. All of us depend on the natural resources of our planet. Each time a species is lost, the complexity, natural balance, and beauty of our world is diminished. And what threatens plants and animals ultimately threatens people as well. 76, According to the first paragraph _______. A. species extinction is only caused by hunting B. human beings protect wife life much more than they do harm to them C. the main cause of species extinction is human activities D. we can stop radically species extinction by 2025 77, The North American bison _______. A. was completely extinct in 1800s B. was not the aim of human hunting C. was raised by settlers in 1800s D. has escaped from extinction thanks to conservationists 78, Species are categorized _______. A. to prevent hunting
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Kết quả (Việt) 1:

Đến năm 2025, trái đất có thể mất nhiều như một phần năm của tất cả các loài được biết đến tồn tại ngày nay. Trong thế kỷ tại, hàng trăm loài đã biến mất, hầu như luôn luôn là kết quả của các hoạt động của con người. Hành kháchHình nền của trang 18pigeon, one familiar example, was a source of food until excessive hunting and habitat loss caused its extinction in 1914. The North American bison, whose populations were decimated by settlers and market hunters in the 1800s, came close to sharing the same fate. Bison survive today only because of the efforts of early conservationists. Today, species require such efforts more urgently than ever. An essential task that falls to present-day conservationists is to determine which species are most, endangered, so that conservation resources' can be applied where action is needed most. Species are categorized by the degree to which their survival in the wild is threatened. World Wildlife Fund offers a sampling of animals and plants that fall mainly within the two most serious categories of- threat: critically endangered and endangered. What threatens these species' existence? Some of the top threats are habitat destruction by unsustainable logging and ever-encroaching human settlement; pollution of water, soil, and air by toxic chemicals; unnatural climate changes due to fossil fuel use; unmanaged fishing that exhausts fish stocks; and illegal hunting to supply the demand for skins, hides, traditional medicines, food, and tourist souvenirs. The list which conservationists presents only a fraction of the species at risk of extinction today and does not include thousands of species whose status we do not yet know. Hundreds of species without common names have been left out, which means that while many mammals are on this list, only a few insects and mollusks are included. Species listed here range from the largest animal on Earth, the blue whale, to the majestic tiger, to the humble thick-shell pond snail. Large or small, beautiful or ugly, all species play a role in the complex circle of life. All of us depend on the natural resources of our planet. Each time a species is lost, the complexity, natural balance, and beauty of our world is diminished. And what threatens plants and animals ultimately threatens people as well. 76, According to the first paragraph _______. A. species extinction is only caused by hunting B. human beings protect wife life much more than they do harm to them C. the main cause of species extinction is human activities D. we can stop radically species extinction by 2025 77, The North American bison _______. A. was completely extinct in 1800s B. was not the aim of human hunting C. was raised by settlers in 1800s D. has escaped from extinction thanks to conservationists 78, Species are categorized _______. A. to prevent huntingBackground image of page 19