2022年12月大学英语六级考试模拟题及答案(五)

　　21. Which of the following is the most appropriate definition of glacier?

　　A. Glaciers fall into two basic categories: valley glaciers and ice sheets.

　　B. Glaciers are huge masses of ice that move under their own weight.

　　C. Glaciers either flow downhill from mountains or flow outward in all directions from dome—like centers of accumulated ice.

　　D. Glaciers are primarily formed in the rocky mountain tops above the snow line.

　　22. What is implied in the passage?

　　A. Glaciers can be divided into many categories according to their shapes and sizes.

　　B. Ice sheets move faster than valley glaciers.

　　C. It takes longer for glaciers to form in Antarctica than in Iceland.

　　D. Valley glaciers are not as old as ice sheets.

　　23. Why does the author mention the formation of glaciers in Iceland in the third paragraph?

　　A. Heavy snowfall and high summer temperatures make glaciers come into existence in a relatively short period of time in Iceland.

　　B. Iceland contains some of the oldest ice sheets in existence.

　　C. Iceland has one of the best—preserved glaciers in the world.

　　D. People expect to find some relatively new glaciers in Iceland.

　　24. What analogy did the author use when describing the formation of glaciers?

　　A. womb B. trap C. crystal D. birth

　　25. Which of the following is the best title for the article?

　　A. Formation of Glaciers B. Sizes and Shapes of Glaciers

　　C. The History of Glaciers D. Why Do Glaciers Move?

　　Questions 26 to 30 are based on the following passage:

　　Botany, the study of plants, occupies a peculiar position in the history of human knowledge. For many thousands of years it was the one field of awareness about which humans had anything more than the vaguest of insights. It is impossible to know today just what our Stone Age ancestors knew about plants, but from what we can observe of pre—industrial societies that still exist, a detailed learning of plants and their properties must be extremely ancient. This is logical. Plants are the basis of the food pyramid for all living things, even for other plants. They have always been enormously important to the welfare of people, not only for food, but also for clothing, weapons, tools, dyes, medicines, shelter, and a great many other purposes. Tribes living today in the jungle of the Amazon recognize literally hundreds of plants and know many properties of each. To them botany, as such, has no name and is probably not even recognized as special branch of “knowledge" at all.

　　Unfortunately, the more industrialized we become the farther away we move from direct contact with plants, and the less distinct our knowledge of botany grows. Yet everyone comes unconsciously on an amazing amount of botanical knowledge, and few people will fail to recognize a rose, an apple, or an orchid. When our Neolithic ancestors, living in the Middle East about 10,000 years ago, discovered that certain grasses could be harvested and their seeds planted for richer yields the next season, the first great step in a new association of plants and humans was taken. Grains were discovered and from them flowed the marvel of agriculture: cultivated crops. From then on, humans would increasingly take their living from the controlled production of a few plants, rather than getting a little here and a little there from many varieties that grew wild. And the accumulated knowledge of tens of thousands of years of experience and intimacy with plants in the wild would begin to fade away.

　　26. According to the first paragraph, early humans .

　　A. did not enjoy the study of botany

　　B. placed great importance on the ownership of properties

　　C. probably had extensive knowledge about plants

　　D. didn't know how to cultivate crops