| From the beginning, migration has been
6ne of the most conspicuous features of human history. Humanity did not appear
simultaneously all over the earth but, according to the current scientific
consensus, first evolved in Africa, and from there spread far and wide. Even
after mankind had populated most of the planet, migration continued to play a
decisive role in history down the centuries, as people contended for territory
and the resources that go with it. In many of history’s biggest movements of
people, the migrants were not volunteers. In the 17th and
18th centuries, 15 million people were taken as slaves from Africa
and shipped to Brazil, the Caribbean and North America. In the 19th
century, between 10 and 40 million indentured workers (契约工人，苦力) were sent in
vast numbers around the world, main A. their fight for territory and resources B. their religious beliefs C. their races D. their sexes [单项选择]From the beginning rivers have played an important part in the life of man. Man of the earliest times used the rivers as a means of traveling. Today rivers still serve as a great waterway for the transport and people.
In ancient times, man settled near rivers or on river banks and built up large empires. Water is the Nature’s most precious gift to man. Man needs water to irrigate his crops, to cook and to wash. In nations all over the world rivers mean life and wealth. They feed and clothe the nations around them. Water is also a source of energy and power. Man constructs huge dams across the river to control the water for irrigation and get the energy needed to drive generators. The electrical power is then directed to homes, cities, factories and television stations. Man uses water each day. His main source of water comes from reservoirs, which in turn get their water from the rivers. Rivers also bring down soil and minerals from the mountains and deposit the A. deltas B. crops C. fresh water life D. soil and minerals 我来回答: 提交
|
