首页
登录
职称英语
Fire, scientists agree, helped give rise to a successful, thriving human pop
Fire, scientists agree, helped give rise to a successful, thriving human pop
游客
2024-08-01
5
管理
问题
Fire, scientists agree, helped give rise to a successful, thriving human population by providing heat for cooking and protection from the cold.
But they don’t agree【C1】______when humans began using fire. Some researchers argue that it【C2】______more than a million years ago when early humans【C3】______their way to Europe from Africa, and【C4】______say it happened much later. Now, a new study reveals that humans did not【C5】______fire until about 400 000 years ago.
Two archaeologists(考古学家)in the US report their【C6】______in the current issue of the Proceedings of the National Academy of Sciences. They looked at excavation(发掘)reports and studies from 141 sites in Europe that were【C7】______1.2 million and 35 000 years old. They think there is no clear evidence of【C8】______fire use until about 400 000 years ago. In Africa,【C9】______there are several sites where there was evidence of fire, those may have been【C10】______fires that occurred in the African grassland.【C11】______, there are also sites older than 400 000 years in Europe that indicate the【C12】______of humans, with the oldest, in Spain, more than a million years old. This means that【C13】______Europe’s extreme winter climates, early humans found a way to【C14】______without the warmth of a fire.【C15】______the researchers mention, early humans are【C16】______and persistent(坚持的). But some researchers【C17】______that it is still a puzzling explanation and it still【C18】______some serious thinking about how【C19】______the human being could have survived on a seasonally【C20】______food supply despite having small teeth and small guts. Up to now, no one has solved this problem yet. [br] 【C9】
选项
A、while
B、when
C、since
D、provided
答案
A
解析
上一句指出没有发现用火的证据,本句又提到在非洲发观几处火的痕迹,很显然这是一种转折关系,所以选while引导让步状语从句,意为“虽然,尽管”when引导时间状语从句;since“由于;自……以后”,引导原因或者时间状语从句;provided“假如,倘若”,引导条件状语从句。
转载请注明原文地址:https://tihaiku.com/zcyy/3701346.html
相关试题推荐
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Scientistsbelievetheyhavesolvedoneoftheenduringmysteriesofthesex
Whenwasthelasttimeyoucomeoutofaverysuccessful【M1】______filmand
Whenwasthelasttimeyoucomeoutofaverysuccessful【M1】______filmand
随机试题
[originaltext]Peoplewithbiggerbrainstendtoscorehigheronstandardte
Whatisthemainpurposeofthelecture?[br]Accordingtotheprofessor,whatc
[originaltext]M:Hello.ThisisGregRicereportingliveinBarrow,Alaska.W:
[originaltext]Theworldisnotonlyhungry;itisalsothirstyforwater.T
Ahappymarriageapparentlyisgoodmedicine,buthostilespousesmaybeha
设随机变量X服从正态分布N(0,1),对给定的α(0
选择承泄区是应考虑的条件有哪些?()A.承泄区与排水系统布置应尽可能协调
以非公开方式向投资者募集资金设立的投资基金是( )。A.私人基金 B.非公开
事业单位预算安排项目的支出年末尚未执行完毕,且下年需要按原用途使用的资金不属于预
垂直于建筑物表面上的风荷载标准值,应在()的乘积基础上,考虑风荷载脉动的增
最新回复
(
0
)