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  3. About one and a half million years ago the climate of the world became much

About one and a half million years ago the climate of the world became much

游客2023-10-18  28
问题     About one and a half million years ago the climate of the world became
much colder. This led to the caps of ice around the North and South Pole 【M1】______
spreading to cover much North America and Northern Europe. Such 【M2】______
periods of cold climate are called ice ages.
    The woolly mammoth lived in northern parts of the world among 300, 000 【M3】______
and 100, 000 years before. It was a favourite prey of Stone Age hunters, 【M4】______
who used its coat for clothes, and the meat as food.
    A fully-grown adult woolly mammoth measured 3 meters to the shoulder 【M5】______
and look like an elephant with huge tusks. However, it had a hairy coat 【M6】______
to keep it warm and a fatty hump to provide it for a good reserve of energy 【M7】______
during harsh winters. When the ice ages end and the climate became warmer, 【M8】______
the woolly mammoth did not adopt to the new conditions. It became extinct. 【M9】______
Complete mammoth carcasses have been founded in the frozen ground of the 【M10】______
Siberian tundra in Russia. [br] 【M5】
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