(
课件网) 学案(三) 高考语篇的价值发掘———提升学科素养 2019·浙江6月高考·阅读理解C篇———对接课标主题：自然灾害与防范，安全常识与自我保护 California has lost half its big trees since the 1930s, according to a study to be published Tuesday and climate change seems to be a major factor (因素)． The number of trees larger than two feet across has declined by 50 percent on more than 46,000 square miles of California forests, the new study finds. No area was spared or unaffected, from the foggy northern coast to the Sierra Nevada Mountains to the San Gabriels above Los Angeles. In the Sierra high country, the number of big trees has fallen by more than 55 percent; in parts of southern California the decline was nearly 75 percent. Many factors contributed to the decline, said Patrick McIntyre, an ecologist who was the lead author of the study. Woodcutters targeted big trees. Housing development pushed into the woods. Aggressive wildfire control has left California forests crowded with small trees that compete with big trees for resources (资源)． But in comparing a study of California forests done in the 1920s and 1930s with another one between 2001 and 2010, McIntyre and his colleagues documented a widespread death of big trees that was evident even in wildlands protected from woodcutting or development. The loss of big trees was greatest in areas where trees had suffered the greatest water shortage. The researchers figured out water stress with a computer model that calculated how much water trees were getting in comparison with how much they needed, taking into account such things as rainfall, air temperature, dampness of soil, and the timing of snowmelt (融雪)． Since the 1930s, McIntyre said, the biggest factors driving up water stress in the state have been rising temperatures, which cause trees to lose more water to the air, and earlier snowmelt, which reduces the water supply available to trees during the dry season. ?好题不厌百回做，每做一次都有新发现 1．What is the second paragraph mainly about A．The seriousness of big-tree loss in California. B．The increasing variety of California big trees. C．The distribution of big trees in California forests. D．The influence of farming on big trees in California. 解析：段落大意题。根据第二段中的“The number of trees ...declined by 50 percent ... more than 55 percent ...75 percent”提到的数字可知，该段主要描述了加利福尼亚州森林中大树急剧减少的严重性，故选A。 语篇解读：本文是一篇说明文。文章主要介绍了美国加利福尼亚州的森林中大树急剧减少的现象，并分析了其原因。 答案：A 2．Which of the following is well-intentioned but may be bad for big trees A．Ecological studies of forests. B．Banning woodcutting. C．Limiting housing development. D．Fire control measures. 解析：推理判断题。根据第三段最后一句可知，声势浩大的野外火灾控制措施虽然一定程度上保护了森林，但同时也导致小树泛滥，与大树竞争资源，从而导致大树数量减少，故选D。 答案：D 3．What is a ma ... ...
