tailieunhanh - Preparation course for toefl ibt reading test 1

You may take notes on Jhe passage while you read. Trie passage will then be removed and you will listen lo a lecture about the same topic. While you listen, you nay aJso taka notes. | MINI-TEST 1 READING Section Directions This section measures your ability to understand an academic passage in English. Most questions are worth 1 point out the last question is worth more than 1 point. The directions for the last question indicate how many points you may receive. You will now begin the Reading section. You will read 1 passage. You will have 20 minutes to read the passage and answer the questions. Mini-Test 1 Reading 279 Read the passage. 20 minutes Paragraph Migration 1 k widely held theory today is that the ancestors of today s Native American peoples traveled to the Western Hemisphere from Asia between 25 000 and 30 000 years ago which was around the same time that Japan was being settled by Stone Age inhabitants. There is dental evidence and blood-type evidence to support this theory. A dental pattern that is found among most ancient human fossils in the Americas is consistent with the dental pattern of ancient human fossils in northeastern Asia. In blood type the fact that blood type B is almost nonexistent among Native American populations but exists in Asian populations leads to the conclusion that migrations to the Americas from Asia took place before the evolution of blood type B which is believed to have occurred around 30 000 years ago. in addition to the dental and blood-type evidence more general evolutionary evidence suggests that it took more than 20 000 years for the variety of physical traits common to Native American populations to evolve and linguists broadly concur that the development of the approximately 500 distinct languages of the Native Americans would require approximately 25 000 years. 2 The proposed migration from Asia to the Americas took place during the ice Age that characterized the Pleistocene epoch. During that period of time there were huge glaciers holding enormous volumes of water and because of the huge glaciers sea levels were as much as 100 meters lower than they are today. The reduced sea levels meant that