2027考研必备英语历年真题试卷及答案解析pdf(1999-2026年)电子版

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2027考研必备英语历年真题试卷及答案解析pdf（1999-2026年）电子版

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Part A

Directions:

Read the following four texts. Answer the questions below each text by choosing[A], [B], [C]

or [D]. Mark your answers on the ANSWER SHEET.(40 points)

Text 1

For thousands of years, donkeys have been critical for propelling human civilizations forward. They've

helped pull wheeled vehicles, carry travelers and move goods across the world. But where and when these

animals first became intertwined with humans has been a mystery. Now, researchers have used genomes of

over 200 donkeys to trace theirdomiestication back to a single event around7,000 years ago in East Africa

about3, 000 years before humans tamed horses. The team published their findings in the journal Science this

month.

"Through their DNA, the animals are telling their history themselves,"co-author Samantha Brooks, ar

equine researcher at the University of Florida, says in a statement.“We usually only get the human's side of

history through written accounts, but of course written history does not always record exactly how something

happened. Looking at theseDNA sequences, we get a biological testimioniy to the environment these animals

lived in and the experiences they survived.

The researchers examined207 genomes firom modern donkeys living in31 countries across the globe

They also looked at genomes from15 wild equids and31 earlier donkeys that lived between about4 ,000 and

100 years ago. The team reconstructed the animals evolutionary tree and used computer modelstopinpoin

the domestication event: when herders in Kenya and the Horn of Africa tamed wild asses. They then traced

how the animals spread across the rest of the continent into Europe and Asia about2 ,500 years later

Though it's still unclear why the original domestication happened, Science News FredaKreier reports

that the event coincided with the Sahara growing larger and drier."Donkeys are champions when it comes to

carrying stuff and are good at going at Paul Sabin deserts,"”co-author Ladovic Orlando, an evolutionary

biologist at Paul Sabin University in France, tells the publication, Prehistoric humans may have tamed

donkeys"help navigate the expanding Sahara

Researchers say these findings could help put donkeys in the spotlight. The animals could benefit fiom

more research: Currently, there are no published genomesfiom donkeys located south of the Equator in

Afirica. But understanding where the animals were first domesticated could guide archaeologists to a narrow

region to search for inisights about the original tamed donkeys.

Not only does human-understanding the equines'genetic makeup help reveal their contribution to

human history, but it also might improve their management in the fiuture, as climate change alters the planet's

environment, write the authors.

21. What can be learned about donkeys firom paragraph1 ?

[A] They seemed mysterious to human ancestors.

[B] They underwent multiple domestication events.

[C] They were tamed at an earlier time than horse

[D] They were vividly portrayed by ancient travelers

【答案】 C

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