2022年人教版高中英语选择性必修第四册同步培优Unit 2 Section Ⅳ 写作指导.docx
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1、Unit 2 Section IV夯基提能作业I .阅读理解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 Californ
2、ia 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
3、 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
4、with big trees for resources.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
5、 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 temperat
6、ure, 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
7、 the dry season.文章大意:本文是一篇调查报告。调查说明,加利福尼亚州的大树变少了,而气候变化 是其中的一个主要因素。1. What is the second paragraph mainly about? AA. 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 bi
8、g trees in California.解析:主旨大意题c第二段中通过列举一系列数字说明,加利福尼亚州的大树减少的严 重性。故A项正确。2. Which of the following is well-intentioned but may be bad for big trees? DA. Ecological studies of forests.B Banning woodcutting.C. Limiting housing development.D. Fire control measures.解析:推理判断题。文章第三段提到了造成加利福尼亚州的大树减少的三个因素: wood
9、cutters, housing development 与 aggressive wildfire controlo 前两个因素直接与大树的减 少有关,如果能控制住,大树就不会减少;而第三个因素控制野火的措施使得加利福尼 亚州的森林里满是跟大树争夺资源的小树,初衷是为了控制野火,这是好的,实那么对大树不 利。故D项正确。3. What is a major cause of the water shortage according to McIntyre? CA. Inadequate snowmelt.B. A longer dry season.C. A warmer climate.D
10、. Dampness of the air.解析:细节理解题。根据文章最后一段中的.the biggest factors driving up water stress in the state have been rising temperatures”可知,水缺乏的主要原因就是气温升高(rising temperatures),即更加温暖的气候。故C项正确。4. What can be a suitable title for the text? AA. Californias Forests: Where Have All the Big Trees Gone?B Cutting of
11、 Big Trees to Be Prohibited in California SoonC. Why Are the Big Trees Important to California Forests?D. Patrick McIntyre: Grow More Big Trees in California解析:标题归纳题。本文是一篇调查报告,第一段就点出主题:California has lost half its big trees since the 1930s。后面具体分析了加利福尼亚州大树的现状、造成大树减少的原因等, A项作为标题最合适。H.七选五The cicada(蝉)h
12、as an interesting life cycle, but most of us only become aware of these insects in summer when they reach adulthood and begin their calls. 1. A Some, like the Golden Emperor, have complicated songs. The summer time calls of the cicada are made by adult males to attract females. Their eggs are usuall
13、y laid in scratches cut through the skin of the tree. Once it has been completed, the adults die.When the eggs hatch, the larvae(幼虫)drop to the ground and live under the soil. 2. C They spend as little as several months for some species or as long as several years for other species buried under grou
14、nd, shedding(蜕下)their skin as they grow. They shed their skin for the last time to become adult cicadas with their wings. 3. D A few days after coming out of the soil, the males call for mates and cycle begins again.The Golden Emperor, whose call is quite different from others, is one of Australians
15、 biggest and prettiest cicadas. 4. G The Golden Emperor calls in groups, but getting to see one up close is very difficult as they fly away when approached. Also, as their breeding season progresses, they gradually move higher up the tree trunks. 5. B The Golden Emperor is a delight just to listen t
16、o if you cant see the insect itself.A. Not all cicadas have simple, loud noise.B This act makes their call the only sign that they are still around.C. The larvae attach themselves to tree roots and feed on their liquid.D. When they have become mature, they come out of the soil as a group.E. Their so
17、ngs call on female to fly to them and fight for next generation.F. If that happens, they will fly away and go to some place that they really love.G. Their call starts with two notes and then rises sharply before it suddenly drops down.文章大意:本文是一篇说明文。文章主要介绍了蝉的一生,其中专门介绍了澳大利亚的 一种名叫Golden Emperor的蝉和其他蝉的不
18、同之处。解析:1 .根据下文“Some, like the Golden Emperor, have complicated songs.”可知有些蝉可以发 出复杂的声音,例如 Golden Emperor。A. Not all cicadas have simple, loud noise.(并非所有 的蝉都发出简单、吵闹的声音。)”符合文意,选项中的simple与后句中的complicated形 成比照。应选A项。2 .根据前文“When the eggs hatch, the larvae drop to the ground and live under the soil.可 知蝉的幼
19、虫由卵孵化后,就会生活在地下。C选项讲述了幼虫在地下生活的状态,larvae是 关键词。应选C项。3 .根据前文“They shed their skin for the last time to become adult cicadas with their wings.” 可知它们最后一次蜕皮,变成有翅膀的成年蝉。D选项中的mature和前文的adult是关键 词。应选D项。4 . 根据前文 “The Golden Emperor, whose call is quite different from others, is one of Australias biggest and pre
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