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[活动公告] 【新SAT考试每日一练】精选题目+重点单词+答案解析(2017/2/10- Reading)

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发表于 2017-2-10 10:39 | 小站社区iPhone客户端

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2017年2月【新SAT 考试每日一练】活动

2017/2/10    Reading

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今天给大家分享的练习题目是:

Building a road through wilderness certainly has a visible impact on local flora and fauna—you're physically paving over a slice of what was once habitat. But roads have less obvious effects, too. Like the introduction of traffic noise, which also takes a toll. "You can see an oil spill but you can't see a traffic noise spill. So convincing people that it's important is a little more difficult," said Heidi Ware.

Ware is an ornithologist at the Intermountain Bird Observatory in Boise, Idaho. She and her colleagues studied the reactions by birds to the sounds of vehicles. And they did it without paving the great outdoors. Instead, they mounted 15 pairs of speakers on Douglas fir trees, along a ridge near Boise, and played traffic noise. They thus created what they call a "phantom road" through the wilderness, which boosted local noise levels 10 decibels higher than those in the surrounding forest.

Turns out just the sounds of traffic scared away a third of the area's usual avian visitors, and cut species diversity too. And birds of multiple species were not able to pack on as much fat to fuel their migrations, when they were forced to dine to the soundtrack of traffic.

Follow-up experiments in the lab found that, when it's noisy, birds spend a lot less time head down, pecking at food, and a lot more time scanning their surroundings.

Ware says Yosemite, Glacier and Rocky Mountain National Parks all have roads that are busy enough to produce these effects. And, short of closing park roads to traffic, she says things like rubberized asphalt and lower speed limits could help cut the noise. "Glacier National Park is going to put up signs, that instead of showing your speed and preventing people from speeding, it's going to show how loud their car is on the road." Which, hopefully, will continue to encourage wilderness lovers to leave no trace—visible or audible.

The main idea of the first paragraph is that the presence of a road through a wilderness area ____________________
(A) affects the environment in ways that can be hard to recognize.
(B) increases the level of unnatural noise and decreases the level of natural noise.
(C) reduces the number of plants that serve as a source of food for wildlife.
(D) leaves the area vulnerable to oil spills and other physical damage caused by cars.


重点单词:
glacier        ['glæsjə]        n. 冰河,冰川
vulnerable        ['vʌlnərəbl]        adj. 易受伤害的,有弱点的       
ware        [wɛə]        n. 制品,器具,货物 vt. 留心,意识到 adj.
recognize        ['rekəgnaiz]        vt. 认出,认可,承认,意识到,表示感激
presence        ['prezns]        n. 出席,到场,存在        
spill        [spil]        v. 溢出,洒,使 ... 流出,泄漏
encourage        [in'kʌridʒ]        vt. 鼓励,促进,支持       
wilderness        ['wildənis]        n. 荒野,荒地
slice        [slais]        n. 薄片,切片
species        ['spi:ʃiz]        n. (单复同)物种,种类

答案及解析:

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发表于 2017-7-21 21:43 |显示全部楼层
今天给大家分享的练习题目是:

Four billion years ago, Earth's continents began taking shape. Scientists long held that this process unfolded gradually. It would have taken millions of years for granite, the primary component of the continental crust, to form in the mantle and migrate to the upper crust, they reasoned. But new research suggests that these events may have proceeded at rather a different pace. According to a report published in the journal Nature, the emergence of granite occurred by way of swift, dynamic and possibly catastrophic events lasting from 1,000 to 100,000 years.

Geologist Alexander Cruden of the University of Toronto and his colleagues turned to experimental studies—melting rock samples, for example—to explore how granite magma forms and how fast it can move. Their results proved surprising. "In the past we thought that granite magma, which cools and crystallizes to form very large granite intrusions, moved up through kilometers of crust as large, solid blobs at rates of about a meter per year," Cruden says. "But we've found that magma actually has quite low viscosity and is relatively runny. Because it is runny, it is able to channel its way from the mantle and lower crust through fractures and cracks that are as small as one meter thick."

According to this model, granite intrusions in Greenland or the Canadian Shield, depending on their size, would have taken only thousands of years to form, which is extraordinarily fast from a geological point of view, Cruden notes.

The first paragraph of this passage serves primarily to __________
(A) introduce two competing explanations of a natural phenomenon.
(B) establish the validity of evidence supporting a new scientific theory.
(C) compare and contrast two perspectives on a recent discovery.
(D) present a detailed timeline of advances in a field of study.



重点单词讲解:
emergence        [i'mə:dʒəns]        n. 出现,浮现,露出        
shield        ['ʃi:ld]        n. 盾,防卫物,盾状物        
swift        [swift]        adj. 快的,迅速的        
dynamic        [dai'næmik]        adj. 动态的,动力的,有活力的        
formation        [fɔ:'meiʃən]        n. 构造,编队,形成,队形,[地]地层
contrast        ['kɔntræst,kən'træst]        n. 差别,对比,对照物        
critical        ['kritikəl]        adj. 批评的,决定性的,危险的,挑剔的        
component        [kəm'pəunənt]        n. 元件,组件,成份        
continental        [.kɔnti'nentl]        adj. 大陆的
lasting        ['læstiŋ]        adj. 永久的,永恒的

答案及解析:
本帖隐藏的内容答案:A
解析:Choice A is the best answer. The first paragraph presents two different explanations for the formation of Earth's continents. The idea "long held" by scientists is that the formation "unfolded gradually" over "millions of years." The other idea, sparked by recent research, is that the formation occurred in a relatively "swift" period of "1,000 to 100,000 years."

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