Câu 42: A. However B. Indeed C. Moreover D. Therefore
Read the following passage and mark the letter A, B, C or D 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 arrows were already being used and dogs bad
already been domesticated.
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 woolly 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.
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