Read the following passage and mark the letter A, B, C orD on your answer sheet to indicate the correct answerto each of the questions from 43 to 50 The time when humans crossed the Arctic land bridge from Siberia to Alaska seems remote to us today, butactually represents a late stage in prehistory of humans, an era when polished stone implements and bows andactually represents a late stage in prehistory of humans, an era when polished stone implements and bows andWhen these early migrants arrived in North America, they found woods and plains dominated by three types ofAmerican mammoths. Those elephants were distinguished from today's elephants mainly by their thick, shaggycoats and their huge, upward-curving tusks. They had arrived on the continent hundreds of thousands of yearsbefore their human followers. The wooly mammoth in the North, the Columbian mammoth in middle NorthAmerica, and the imperial mammoth of the South, together with their distant cousins the mastodons, dominated theland. Here, as in the Old World, there is evidence that humans hunted these elephants,as shown by numerous spearpoints found with mammoth remains.Then, at the end of the Ice Age, when the last glaciers had retreated, there was a relatively sudden andwidespread extinction of elephants. In the New World, both mammoths and mastodons disappeared. In the OldWorld, only Indian and African elephants survived.Why did the huge, seemingly successful mammoths disappear? Were humans connected with their extinction?Perhaps, but at the time, although they were hunters, humans were still widely scattered and not very numerous. Itis difficult to see how they could have prevailed over the mammoth to such an extent. Which of the following types of the elephants does the author discuss in the most detail in the passage?

Read the following passage and mark the letter A, B, C orD on your answer sheet to indicate the correct answer to each of the questions from 43 to 50
The time when humans crossed the Arctic land bridge from Siberia to Alaska seems remote to us today, but actually represents a late stage in prehistory of humans, an era when polished stone implements and bows and actually represents a late stage in prehistory of humans, an era when polished stone implements and bows and When these early migrants arrived in North America, they found woods and plains dominated by three types of American mammoths. Those elephants were distinguished from today's elephants mainly by their thick, shaggy coats and their huge, upward-curving tusks. They had arrived on the continent hundreds of thousands of years  before their human followers. The wooly mammoth in the North, the Columbian mammoth in middle North America, and the imperial mammoth of the South, together with their distant cousins the mastodons, dominated the land. Here, as in the Old World, there is evidence that humans hunted these elephants,as shown by numerous spear points found with mammoth remains. Then, at the end of the Ice Age, when the last glaciers had retreated, there was a relatively sudden and widespread extinction of elephants. In the New World, both mammoths and mastodons disappeared. In the Old World, only Indian and African elephants survived. Why did the huge, seemingly successful mammoths disappear? Were humans connected with their extinction? Perhaps, but at the time, although they were hunters, humans were still widely scattered and not very numerous. It is difficult to see how they could have prevailed over the mammoth to such an extent.

Which of the following types of the elephants does the author discuss in the most detail in the passage?