Temperature Record While temperature records in history exist for certain regions of the United States, like the East Coast and the Northwest, no such record exists for the North American Great Plains. But now, a team of scientists created a temperature record for that area dating back 12,000 years. It is the first such record for a region in the central part of North America stretching from southern Canada to north Texas. Temperature records are usually created by assessing fossil pollens ( 花粉 ), which are better preserved in damp areas. But in the Great Plains, pollen saving is virtually nonexistent. Nordt developed the first comprehensive temperature record by assessing the behavior of the stable composition of buried soils. He examined the relationship between the waves in the abundance of warm-season grasses and the mean July temperature from 61 modern native grasslands and applied a mathematical equation of what he found in the modern record to the buried soil 51. According to the passage, the North Amorican Great Plains refers to the region in the central part of North America ____.A. ranging from northem Texas to north Canada B. ranging from southern Canada to north Texas C. ranging from northern Canada to south Texas D. ranging from southern Texas to south Canada 52. Nordt developed the first comprehensive temperature record for the Great Plains by ___. A. testing the mean July temperature fom 61 modern nat ve grasslanids B. assessing the behnr o the stable compositon of buried solls C. examining fuctuntionEin the tbundonce of warm-season grasses
Temperature Record
While temperature records in history exist for certain regions of the United States, like the East Coast and the Northwest, no such record exists for the North American Great Plains. But now, a team of scientists created a temperature record for that area dating back 12,000 years. It is the first such record for a region in the central part of North America stretching from southern Canada to north Texas.
Temperature records are usually created by assessing fossil pollens ( 花粉 ), which are better preserved in damp areas. But in the Great Plains, pollen saving is virtually nonexistent. Nordt developed the first comprehensive temperature record by assessing the behavior of the stable composition of buried soils. He examined the relationship between the waves in the abundance of warm-season grasses and the mean July temperature from 61 modern native grasslands and applied a mathematical equation of what he found in the modern record to the buried soil
51. According to the passage, the North Amorican Great Plains refers to the region in the central part of North America ____.
A. ranging from northem Texas to north Canada
B. ranging from southern Canada to north Texas
C. ranging from northern Canada to south Texas
D. ranging from southern Texas to south Canada
52. Nordt developed the first comprehensive temperature record for the Great Plains by ___.
A. testing the mean July temperature fom 61 modern nat ve grasslanids
B. assessing the behnr o the stable compositon of buried solls
C. examining fuctuntionEin the tbundonce of warm-season grasses
题目解答
答案
【正确答案】51.B 52.B
51.题目要求为“根据文章,北美大平原指的是北美中部地区____”,该题定位到文章第一段“no such record exists for the North American Great Plains. ... It is the first such record for a region in the central part of North America stretching from southern Canada to north Texas.”,“date back”意为“追溯”,可知北美大平原原本没有这样的记录,但是科学家创造的记录正是北美中部北美中部从加拿大南部到德克萨斯州北部地区,即该区域的记录。结合选项A.从德克萨斯州北部到加拿大北部、B.从加拿大南部到德克萨斯州北部、C.从加拿大北部到德克萨斯州南部、D.从德克萨斯州南部到加拿大南部,可选出答案B。
52.题目要求为“Nordt通过___为大平原建立了第一个全面的温度记录”,定位到文章第二段第三句话“Nordt developed the first comprehensive temperature record by assessing the behavior of the stable composition of buried soils”,“record by assessing the behavior of the stable composition of buried soils”作后置定语修饰temperature,“the behavior of”意为“...的行为”,可知是“Nordt通过评估地下土壤的稳定成分的行为,建立了第一个综合温度记录”。结合选项:A.测试了61个现代草原的七月平均温度、B.评估埋地土壤的稳定成分、C.检查功能在温暖季节的草,可选出答案B。
原文翻译:
虽然历史上有美国某些地区的温度记录,如东海岸和西北部,但北美大平原没有这样的记录。但是现在,一组科学家创造了该地区12000年前的温度记录。这是北美中部从加拿大南部到德克萨斯州北部地区首次有这样的记录。
温度记录通常是通过评估保存在潮湿地区的化石花粉来创建的。但在大平原,几乎不存在花粉保存。Nordt通过评估地下土壤的稳定成分的行为,建立了第一个综合温度记录。他研究了温暖季节大量草的波浪与61个现代本土草原7月平均温度之间的关系,并将他在现代记录中发现的数学方程应用于埋在地下的土壤
解析
考查要点:
- 地理范围定位:根据原文描述,准确识别北美大平原的地理范围。
- 细节理解:抓住关键信息,明确Nordt建立温度记录的核心方法。
解题思路:
- 第51题:需定位原文中对“North American Great Plains”地理范围的直接描述,注意方向词(如“southern Canada”与“north Texas”)的对应关系。
- 第52题:聚焦Nordt的方法,排除干扰选项,抓住“assessing the behavior of the stable composition of buried soils”这一核心表述。
第51题
关键信息:
原文明确指出:“It is the first such record for a region in the central part of North America stretching from southern Canada to north Texas.”
- 选项B(southern Canada to north Texas)与原文完全一致。
- 干扰项排除:
- A选项颠倒了方向(north Texas应为终点);
- C、D选项涉及“southern Texas”或“northern Canada”,与原文不符。
第52题
关键信息:
Nordt的方法为:“developed the first comprehensive temperature record by assessing the behavior of the stable composition of buried soils.”
- 选项B直接对应原文中的核心方法。
- 干扰项排除:
- A选项描述的是后续步骤(测试现代数据),非主要方法;
- C选项仅涉及对草类丰度的分析,属于方法中的部分环节。