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24.What does the underlined word"catalyst"in paragraph 2 mean
A.Foundation.
B.Solution.
C.Symbol.
D.Cause.
25.What does the author's mother attach most importance to
A.The author's overall wellbeing
B.The sacrifice for her daughter.
C.The relief of the author's stress.
D.The author's devotion to schoolwork.
26.What does the use of the"rubber band"try to illustrate
A.A conflict with her father about goals
B.A bond between the author and her mother.
C.A shift in the author's outlook on pressure.
D.A link to the author's academic performance.
27.What does the author mean by saying"reaching for the moon"
A.She will be unbeatable.
B.She will continue to aim high.
C.She has achieved all her goals.
D.She has a passion for astronomy.
C
Approximately 4000 years following the last glacial period,hunter-gatherer communities
encountered another sudden climate shift that forced rapid adaptation to significantly colder conditions.
The 8.2 ka event,occurring 8200 years ago,brought about temperature declines of up to 6C within
mere decades.Meanwhile,the breakaway of a Scotland-sized landmass from the Norwegian continental
shelf generated a massive tsunami that completed Britain's geographical separation from mainland
Europe.
Despite these severe environmental challenges,northern hemisphere (populations
demonstrated remarkable toughness.Through it all,people across the northern hemisphere survived,
some by packing up and moving,others by sticking it out.Rick Schulting from the University of Oxford
notes:"These communities were not passive victims but actively adapted to changing circumstances."
While previous research had examined regional impacts,Schulting's comprehensive study
compared archaeological evidence and environmental records across northwestern Europe and souther
Siberia.To understand how they adapted,scientists compared archaeological findings,such as burial
sites and ancient remains,with environmental evidence preserved in ancient lake beds.This
combination of clues allowed them to reconstruct past changes in climate and landscape with
remarkable precision.
Adaptation strategies varied significantly across regions.Coastal communities in Norway's Oslo
fjiord expanded through increased reliance on marine resources like fish and seals,while Lake Baikal
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