安徽省2025-2026学年第一学期高一阶段联考(26-L-112A)化学A答案
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安徽省2025-2026学年第一学期高一阶段联考(26-L-112A)政治A试题
安徽省2025-2026学年第一学期高一阶段联考(26-L-112A)化学A试题
Dogs have been close four-legged friends of humans for as long as we can remember, but exactly how long has this relationship lasted Scientists may finally have an answer, thanks to a new study on ancient human remains found in Alaska. The research suggests that the strong bond between humans and the ancestors of today’s dogs began 12,000 years ago.
“We now have proof that dogs and humans had close connections earlier than we thought in the Americas” said the study’s lead author, Francois Lanoe, an assistant researcher at the University of Arizona’s School of Anthropology.
“People interested in the origins of the Americas want to know if the first humans arrived with dogs. Until we find these animals in old digging sites, we can only guess — it’s hard to confirm. This discovery is very significant.”
In a 2018 archaeological study, the same team found a lower leg bone from an adult dog-like animal at a site in Alaska. Carbon dating showed the animal lived 12,000 years ago, near the end of the Ice Age. More recently, in June 2023, the team dug up an 8,100-year-old jawbone from a similar animal at a nearby site.
For the new study, scientists performed chemical tests on these bones. They found salmon proteins, suggesting these animals ate fish regularly. This was unusual because dog-like animals at the time only hunted land animals, showing human influence.
While the team believes this is the earliest known relationship between humans and dogs, they say it’s too soon to be certain. A key question remains: “What defines a dog ” said Dr. Ben Potter, a co-author of the study and an archaeologist at the University of Alaska Fairbanks. Though these creatures acted and looked like dogs, they might be too ancient to be genetically connected to modern dogs we know today.
28. What is the main idea of the passage
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5、安徽省2025-2026学年第一学期高一阶段联考(26-L-112A)生物A答案
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4、安徽省2025-2026学年第一学期高一阶段联考(26-L-112A)化学A试题
1、安徽省2025-2026学年第一学期高一阶段联考(26-L-112A)政治A答案
D. 以上刻度尺均可测量
2. 测量几块木板的长度时，下列木板的摆放和读数的方法均正确的是( )
A B C D
3. 小明测量出某物体的长度是 38.89 cm，则他所使用的刻度尺的分度值、此数据的准确值和估读值分别是( )
A. 1 mm,38.89 cm,0.09 cm
B. 1 cm,38.8 cm,0.09 cm
C. 1 cm,38.0 cm,0.89 cm
安徽省2025-2026学年第一学期高一阶段联考(26-L-112A)生物A答案
