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【C4】
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【C20】
听力原文： At least seven people were killed in seven floods judged to be the worst to hit southeast Queensland this century. Rivers throughout the Australian region have run, as much as 9 m higher than usual, forcing hundreds in rural towns to flee their homes. Meanwhile, flooding in the North worsened in the wake of Cyclone Rona, which swept through Cairns and Ingham, causing widespread damage.
What can we learn about rivers in Australia？
The real tragedy of the rapid settlement of the Great Plains 【C8】______ the shameful way in which the American Indians were treated. Threatened with the destruction of their whole【C9】______ of life, the Indians fought back savagely【C10】______ the white man's final thrust(强行推进). Justice was almost entirely 【C11】______ the Indians' side. The land was clearly theirs; frequently their title was legally【C12】______ by a treaty negotiated with the federal government. The Indians,【C13】______ , lacked the military force and political power to protect this right. Not only did white men encroached 【C14】______ the Indians' hunting ground, but they rapidly destroyed the Indians' principal【C15】______ of existence--the buffalo. It has been【C16】______ that some 15 million buffalo roamed the plains in the 1860s. By 1869 the railroads【C17】______ the herd in half, and by 1875 the southern herd was 【C18】______ eliminated. By the middle of the 1880s the northern herd was also a thing of the past. Particularly irritating to the Indians was the fact【C19】______ the white man frequently killed the buffalo merely for sport, leaving the valuable animal to rot【C20】______ .
【C1】
听力原文： There are over 6,000 million people in the world today, and the total is increasing at the rate of more than 89 million a year.
The population is growing more quickly in some parts of the world than others. The continents with the fastest growth rates are Latin America and Africa. Asia comes third but because its present population is so large it is there that by far the greatest number of people will be added before the end of the century.
The main reason for the population explosion is not so much a rise in birth rates as a fall in death rates as a result of improvements in public health services and medical care.
The sudden increase in the population of the developing countries has come at a difficult time. Even if their population had not grown so fast they would have been facing a desperate struggle to bring the standard of living of their people to the point at which there was enough food, housing, education, medical care and employment for everyone to have a reasonable life.
The most pressing problem created by the rapid increase in population is a shortage of food. Over the past two years the total amount of food has decreased, and of course the total amount of food per person has decreased even more sharply.
As more and more babies born in developing countries have been surviving infancy, there is a shortage of schools and teachers, hospitals and doctors. Farming land is becoming scarce, and there are too few jobs and unemployment leads to further poverty.
This talk covers each of the following topics EXCEPT ______
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