A. HOWEVER B. INDEED C. MOREOVER D. THEREFOREREAD THE FOLLOWING...

Câu 42: A. However B. Indeed C. Moreover D. Therefore

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

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 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.