首页/SAT/正文

新SAT词汇题真题讲解

来源:网络 2020-07-29 14:37:02

免费留学咨询表

新sat词汇题实例讲解! 今天小编为大家带来的是新SAT词汇题真题讲解的相关内容,大家可以在通过题目和讲解巩固一下知识点,快来看看吧!

新SAT OG Test03 阅读 Passage5 Q42  This passage is adapted from Carolyn Gramling, "Source of Mysterious

Medieval Eruption Identified." ©2013 by American Association for the Advancement

of Science.  1 About 750 years ago, a powerful volcano erupted somewhere on Earth,

kicking off a centuries-long cold snap known as the Little Ice Age. Identifying

the Line volcano responsible has been tricky.  2 That a powerful volcano erupted somewhere in the world, sometime in the

Middle Ages, is written in polar ice cores in the form of layers of sulfate

deposits and tiny shards of volcanic glass. These cores suggest that the amount

of sulfur the mystery volcano sent into the stratosphere put it firmly among the

ranks of the strongest climate-perturbing eruptions of the current geological

epoch, the Holocene, a period that stretches from 10,000 years ago to the

present. A haze of stratospheric sulfur cools the climate by reflecting solar

energy back into Space.  3 In 2012, a team of scientists led by geochemist Gifford Miller

strengthened the link between the mystery eruption and the onset of the Little

Ice Age by using radiocarbon dating of dead plant material from beneath the ice

caps on Baffin Island and Iceland, as well as ice and sediment core data, to

determine that the cold summers and ice growth began abruptly between 1275 and

1300 C.E. (and became intensified between 1430 and 1455 C.E.).  4 Such a sudden onset pointed to a huge volcanic eruption injecting sulfur

into the stratosphere and starting the cooling. Subsequent, unusually large and

frequent eruptions of other volcanoes, as well as sea-ice/ocean feedbacks

persisting long after the aerosols have been removed from the atmosphere, may

have prolonged the cooling through the 1700s. Volcanologist Franck Lavigne and

colleagues now think they´ve identified the volcano in question: Indonesia´s

Samalas. One line of evidence, they note, is historical records. According to

Babad Lombok, records of the island written on palm leaves in Old Javanese,

Samalas erupted catastrophically before the end of the 13th century, devastating

surrounding villages—including Lombok´s capital at the time, Pamatan—with ash

and fast-moving sweeps of hot rock and gas called pyroclastic flows.  5 The researchers then began to reconstruct the formation of the large,

800-meter-deep caldera [a basin-shaped volcanic crater] that now sits atop the

volcano. They examined 130 outcrops on the flanks of the volcano, exposing

sequences of pumice—ash hardened into rock—and other pyroclastic material. The

volume of ash deposited, and the estimated height of the eruption plume (43

kilometers above sea level) put the eruption´s magnitude at a minimum of 7 on

the volcanic explosivity index (which has a scale of 1 to 8)—making it one of

the largest known in the Holocene.  6 The team also performed radiocarbon analyses on carbonized tree trunks

and branches buried within the pyroclastic deposits to confirm the date of the

eruption; it could not, they concluded, have happened before 1257 C.E., and

certainly happened in the 13 th century.  7 It´s not a total surprise that an Indonesian volcano might be the source

of the eruption, Miller says. "An equatorial eruption is more consistent with

the apparent climate impacts." And, he adds, with sulfate appearing in both

polar ice caps—Arctic and Antarctic—there is "a strong consensus" that this also

supports an equatorial source.  8 Another possible candidate—both in terms of timing and geographical

location—is Ecuador´s Quilotoa, estimated to have last erupted between 1147 and

1320 C.E. But when Lavigne´s team examined shards of volcanic glass from this

volcano, they found that they didn´t match the chemical composition of the glass

found in polar ice cores, whereas the Samalas glass is a much closer match.

That, they suggest, further strengthens the case that Samalas was responsible

for the medieval "year without summer" in 1258 C.E.  图58  As in the highlighted phrase in Paragraph 2 "is written in" most likely

to  A . demonstrate the concept of the hands-on nature of the work done by

scientists.  B . highlight the fact that scientists often write about their

discoveries.  C . underscore the sense of importance that scientists have regarding their

work.  D . reinforce the idea that the evidence is there and can be interpreted by

scientists.  答案解析:  1.Choice D is the best answer. According to Paragraph 2, "That a powerful

volcano erupted somewhere in the world, sometime in the Middle Ages, is written

in polar ice cores in the form of layers of sulfate deposits and tiny shards of

volcanic glass." The phrase "is written in" reinforces the idea that the polar

ice caps contain evidence of the volcanic eruption, and that scientists can

interpret this evidence by examining the "sulfate deposits and tiny shards of

volcanic glass." Choices A, B, and С are incorrect because the author does not

use the phrase "is written in" to demonstrate the concept of the hands-on nature

of the scientists´ work, highlight the fact that scientists often write about

their work, or underscore the sense of importance scientists have about their

work.  2.How do the words "can," "may," and "could" in the third paragraph help

establish the tone of the paragraph?  A . They create an optimistic tone that makes clear the authors are hopeful

about the effects of their research on colony collapse disorder.  B . They create a dubious tone that makes clear the authors do not have

confidence in the usefulness of the research described.  C . They create a tentative tone that makes clear the authors suspect but

do not know that their hypothesis is correct.  D . They create a critical tone that makes clear the authors are skeptical

of claims that pyrethrums are inherent in mono-crops.  答案解析  Choice С is the best answer. When discussing problems with bee colonies,

the authors use phrases like "we suspect" ((Paragraph 3)) and "we postulate"

((Paragraph 3)) to show they are hypothesizing reasons for bee colonies´

susceptibility to mite infestations. The use of "can," "may," and "could"

creates a tentative tone and provides further evidence that the authors believe,

but are not certain, that their hypothesis is correct. Choices A, B, and D are

incorrect because the authors´ use of "can," "may," and "could" does not create

an optimistic, dubious, or critical tone.  以上就是学霸小编给大家分享的新SAT词汇题真题讲解全部内容,希望能给有需要的同学提供帮助。如果想了解更多关于SAT考试如何练习及相关信息,请关注学霸武汉分校平台,免费获取备考提分解决方案,或欢迎 点击这里 进行网络咨询,我们会给您提供专业的服务。最后,预祝大家SAT考试能取得理想的成绩。

免费留学咨询申请表 (免费推荐留学中介/审核留学方案/获取权威留学资料等)

 

为了更好的为您服务,请补全方案信息

确定