首页
登录
职称英语
Many prehistoric people subsisted as hunters and gatherers. Undoubtedly,
Many prehistoric people subsisted as hunters and gatherers. Undoubtedly,
游客
2025-02-09
22
管理
问题
Many prehistoric people subsisted as hunters and gatherers. Undoubtedly, game
animals, including some very large species, provided major components of human diets.
An important controversy centering on the question of human effects on prehistoric wildlife
concerns the sudden disappearance of so many species of large animals at or near the end
(5) of the Pleistocene epoch. Most paleontologists suspect that abrupt changes in climate led
to the mass extinctions. Others, however, have concluded that prehistoric people drove
many of those species to extinction through over-hunting. In their "Pleistocene overkill
hypothesis," they cite what seems to be a remarkable coincidence between the arrival of
prehistoric peoples in North and South America and the time during which mammoths,
(10) giant ground sloths, the giant bison, and numerous other large mammals became extinct.
Perhaps the human species was driving others to extinction long before the dawn of history.
Hunter-gatherers may have contributed to Pleistocene extinctions in more indirect
ways. Besides over-hunting, at least three other kinds of effects have been suggested:
direct competition, imbalances between competing species of game animals, and early
(15) agricultural practices. Direct competition may have brought about the demise of large
carnivores such as the saber-toothed cats. These animals simply may have been unable
to compete with the increasingly sophisticated hunting skills of Pleistocene people.
Human hunters could have caused imbalances among game animals, leading to the
extinctions of species less able to compete. When other predators such as the gray wolf
(20) prey upon large mammals, they generally take high proportions of each year s crop of
young. Some human hunters, in contrast, tend to take the various age-groups of large animals
in proportion to their actual occurrence. If such hunters first competed with the larger
predators and then replaced them. they may have allowed more young to survive each year,
gradually increasing the populations of favored species As these populations expanded,
(25) they in turn may have competed with other game species for the same environmental niche,
forcing the less hunted species into extinction. This theory, suggests that human hunters
played an indirect role in Pleistocene extinctions by hunting one species more than another.
选项
A、The effects of human activities on prehistoric wildlife
B、The origins of the hunter-gatherer way of life
C、The diets of large animals of the Pleistocene epoch
D、The change in climate at the end of the Pleistocene epoch
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3950002.html
相关试题推荐
ChooseTWOletters,A-E.ForwhichTWOreasonsdoesthespeakersaypeoplegive
Choosethecorrectletter,A,BorC.[br]Thestudentthinkspeople[originalte
Whatdoesthetermwhite-watercanoeingcomefrom?[originaltext]Alotofpeople
ChooseTWOletters,A-E.WhichTWOtopicsdopeoplemostfrequentlyaskabout?A
Choosethecorrectletter,A,B,orC.[br]HowdoesJenfindtheotherpeoplei
Whichattitudeisassociatedwiththefollowingpeopleduringtheconversation?
Whichattitudeisassociatedwiththefollowingpeopleduringtheconversation?
Whichattitudeisassociatedwiththefollowingpeopleduringtheconversation?
Whichattitudeisassociatedwiththefollowingpeopleduringtheconversation?
Choosethecorrectletter,A,BorC.[br]Whatkindofclotheswillpeoplebew
随机试题
"DidyougotoBelgiumlastyearwhenyouwereonabusinesstriptoEurope?""N
[originaltext]M:Themainrequirementsforgraduationarebeingchanged.W:Ye
AclassactionlawsuithasbeenfiledagainstaprominentTorontodoctorby
关于骨纤维异常增殖症,描述不正确的是A.纤维组织中骨小梁形态不一 B.有纤维化
B本题属于构造法类题目。通过分析可知,当第2至第10名箱子重量相等时,最重箱子重量最重。假设其余箱子的i量是X,那么最重的箱子童量为2.5x,也就是说9x+
下列关于公开发行公司债券的说法正确的有()。 ①公开发行公司债券筹集的资金
外科病人最常见的缺水A.原发性缺水 B.继发性缺水 C.高渗性缺水 D.低
电缆本体及附件起火、爆炸的现象之一是故障电缆本体及附件所在间隔(____)跳闸。
形成房地产供给的条件有()。A.房地产开发企业和拥有者愿意供给 B.房地产开发
一位A型血的男子有一男一女两个孩子,其中女孩的血清与其父的红细胞不发生凝集,而男
最新回复
(
0
)