根据背景资料整理如下，请大家确认下。
关于这一题，结合整理出的段落应该选D，关于plant相关。
2.细节题：（定位第二段）专家最可能在proposal中plan什么：我选C，不肯定对，但跟文章最相关
A是提供大型动物居住地
B是fencing off 什么植物
C是做大型动物的DNA测试
D是plant什么什么，记不清了
E是创造长期经济效益
背景资料整合：
P1:
Although the cheetahs, lions and mammoths that once roamed North America are extinct, the same species or close relatives have survived elsewhere, and our discussions focused on introducing these substitutes to North American ecosystems. We believe that these efforts hold the potential to partially restore important ecological processes, such as predation and browsing, to ecosystems where they have been absent for millennia. The substitutes would also bring economic and cultural benefits
P2:
Where large predators and herbivores still remain, they play pivotal roles. In Alaska, sea otters maintain kelp forest ecosystems by keeping herbivores that eat kelp, such as sea urchins, in check. In Africa, elephants are keystone players; as they move through an area, their knocking down trees and trampling create a habitat in which certain plants and animals can fl ourish. Lions and other predators control the populations of African herbivores, which in turn influence the distribution of plants and soil nutrients.
P3
Fourth, bringing megafauna back to America would also bring tourist and other dollars into nearby communities and enhance the public’s appreciation of the natural world. More than 1.5 million people visit San Diego’s Wild Animal Park every year to catch a glimpse of large mammals. Only a handful of U.S. national parks receive that many visitors. Last, the loss of some of the remaining species of megafauna in Africa and Asia within this century seems likely—Pleistocene rewilding could help reverse that.
P4
Rubenstein and colleagues go on to say, “Modern day proxies species are wrong . . . different genetically from the species that occurred in North America during the Pleistocene.” True, but not that different. Available evidence indicates that the lions in Africa and Asia today are the same species, albeit of smaller stature, as the lions that prowled North America 13 millennia ago. Recent studies of ancient DNA have elucidated close relationships between extinct elephant and horse species and those alive today.
Many have expressed concern about the fact that North America’s ecosystems are not the same today as they were 13,000 years ago and that reintroduced animals might therefore be unable to survive in them. Whereas habitats are and will continue to be dynamic on a timescale of thousands of years, very few plants or small mammals went extinct during the late Pleistocene. The major missing component of North American ecosystems today compared with the Pleistocene is the megafauna, which we can infer are critical cogs in the wheels. —C.J.D.
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