TPO 第27套 综合写作题目重新选题
阅读材料
收起The little ice age was a period of usually cold temperature in many parts of the world that lasted from about the year 1350 until 1900.
There were unusually harsh winters, and glaciers grew larger in many areas. Scientists have long wondered what caused the Little Ice Age. Several possible causes have been proposed.
First, the cooling may have been caused by disrupting of ocean currents. Before the Little Ice Age, there was a period of unusually warm weather during which glaciers melted.These melted glaciers sent a large amount of cold freshwater into the Gulf Stream,a large ocean current that strongly affects Earth's climate. Some scientists believe that this freshwater was enough to temporarily disrupt the Gulf Stream.Such a disruption could have caused the Little Ice Age.
Second, volcanic eruption could have caused the Little Ice Age. When volcanoes erupt, they send dark clouds of dust and sulfur gas into the atmosphere. These clouds, which can spread over great areas, block some sunlight from reaching Earth's surface. This can decrease the global temperatures. Scientists know of several volcanic eruptions that took place during the Little Ice Age.
Third, Substantial decreases in human populations may have contributed indirectly to the cooling of the climate. For a variety of reasons (disease, warfare, social disruption),the human population just before the Little Ice Age and during the early part of it was lower than it had been in a long time. Forest trees started growing on fields that were no longer used for agriculture. Since trees absorb carbon dioxide, a greenhouse gas, they decrease the greenhouse effect that keeps Earth warm. With more forest trees absorbing carbon dioxide, Earth became cooler.
听力材料
收起写作题目
收起Summarize the points made in the lecture, being sure to explain how they challenged the specific theories presented in the reading passage.
答题辅导
收起1. 阅读要点概括
Mainpoint:小冰河时代的成因
Subpoint 1. 冰川融化,海洋洋流阻断
Subpoint 2. 火山爆发,降低全球温度
Subpoint 3. 人口降低,耕地变树吸二氧化碳
2. 听力要点概括
Point 1. Gulf Stream
Climate change only in NA and Europe
但小冰河时代还影响了北半球,NZ,SA;
Point 2. Volcano Theory
会遮大气层
但会发出刺眼亮光,日出,雪变色,事实却没人看到
农业减少,温室效应减少
农业have no time,因人口很快恢复,树木很快被砍伐