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[单选题]Deep inside a mountain near Sweetwater in East Tennessee is a bady?of water known as the Lost?Sea.It is listed by the Guinness Book of World Records as the world′s largest underground lake.The Lost Sea is part of an extensive and historic cave system called Craighead Caverns.
The caverns have been known and used since the days of the Cherokee Indian nation.The cave?expands into a series of huge rooms from a small opening on the side of the mountain.Approximately?one mile from the entrance,in a room called-The Council Room",many Indian artifacts have been?found.Some of the items discovered include pottery,arrowheads,weapons,and jewelry.
For many years there were persistent rumors of a large underground lake somewhere in a cave,but it was not discovered until 1905.In that year,a thirteen-year-old boy named Ben Sands crawled through a small opening three hundred feet underground.:He found himself in a large cave half filled?with water.
Today tourists visit the Lost Sea and ride far out onto it in glass-bottomed boats powered by electric motors.More than thirteen acres of water have been mapped out so far and still no end to the lake has been found.Even though teams of divers have tried to explore the Lost Sea,the full extent
of it is still unknown.
It can be inferred from the passage that the Craighead Caverns presently serve as__________.
A.an underground testing site
B.an Indian meeting ground
C.a tourist attraction
D.a motor boat race course
[单选题]The vacuum tube,invented near the beginning of our century,gave us the use of radio waves,an energy source never before（ ）,and later opened the road for television.
A.was captured
B.captured
C.capturing
D.has been captured
[单选题]Near the beginning of his presidency,Barack Obama gave a speech to Congress that laid out a goal for the future:"By 2020,America will once again have the highest proportion of college graduates in the world.At the time,America was 12th,according to the Organization for Economic Cooperation and Development Almost a decade later,and with 2020 not far off,where do things stand?The percentage of Americans between the ages of 25 and 34 who had earned an associate's degree rose only by 7.4 percent be-tween 2007 and 2017-a difference of more than 5 million people,according to the U.S.Census Bureau's American Community Survey.Still,that puts America at 10th in the world,according to the latest available data But even though progress has been made,the data remain quite uneven.A pair of reports released on Wednesday by The Education Trust,an advocacy group for low-income and minority students,break down the attainment data more finely.They found that the share of black adults who hold a bachelors or associate's degree--31 percent-is roughly two-thirds that of white ones-47 percent.And Latinos,at about 23 percent,are just half as likely.Further,the report shows,there is not a single state in the country where black and Latino adults are as likely to have earned a college credential as their white counterparts At the root of these differences in attainment rates are social and economic disparities that continue to benefit certain races over others.Still,graduation rates have improved over the past decade,particu larly among latinos,as a report from the left-leaning Center for American Progress shows--and there is a significant difference between the rates of native-born Latino adults and those who were born outside of the United States.（The latter are less likely to have earned a degree.It's these race-by-race attainment rates that the report advises policymakers to pay attention to-overall graduation rates can obscure how the educational system underserves certain groups More than 40 states have outlined goals for these attainment rates in the past decade,often including specific goal rates for black and Latino residents.What can be done to reach those goals?Well,for one,lawmakers can make sure race factors centrally into policy conversations-and that can look different for different states.For some,it could be as simple as diverting more resources to campuses that primarily serve minority students.A recent report from the American Council on Education,a leading higher-education trade group,found that minority-serving institutions have a special knack for changing students socio economic fortunes of students.Such institutions--including historically black colleges and universities and Hispanic-serving institutions-propelled students from the lowest rung of the economic ladder to the highest at least double the rate of colleges that were not focused on enrolling a particular minority
What would be the best title for the text?
A.Obama's Endeavor for Educational Equality
B.The College-Graduation Problem All States Have
C.The Fight Against Educational Inequality
D.Higher Attainment Rates and More Elites
[不定项选择题]Cats have the widest hearing range of nearly any mammal”not only can they perceive sound in what we define as the “ultrasonic” range, they can also appreciate all the bass Dr Dre can throw at them. They can swivel their whiskers forwards while hunting to provide a kind of short-range radar.And they can see exceptionally well in the dark thanks to a reflective surface behind the retina that bounces lightback, giving it a second chance to hit a photoreceptor. They see more distinct images per second than we do.
Dog partisans will appeal to the dog’s allegedly superior intelligence — though if that were the primary criterion for choosing a pet, one would expect to see a lot more crows and squid on leads around town. In fact, cats are rather cleverer than commonly assumed, as the biologist and animal-behaviour expert John Bradshaw shows in his new book.They can even be trained to an extent which was news to me Bradshaw’s book mixes pellets of cat lore with accounts of feline evolution, anatomy, genetics and development from newborn kitten to adulthood, plus descriptions of cat-psychology experiments in the laboratory, many of which he has conducted himself. Some of the most interesting parts indicate holes in our current scientific knowledge. “Many mother cats try to move their litters at least once before they wean them,” he observes, “but science has yet to find out why”. No one knows why cats go crazy for catnip, nor why they are able “to classify shapes according to whether they are closed or open.” Kittens, meanwhile, “may also use special movements of their tails to signal playfulness, but so far no scientist has been able to decode these”. As far as potential research projects go, decoding the tail-language of playing kittens must be about the interesting unsolved problem in science.
The cat is an apparently phlegmatic beast, but Bradshaw points out that cats experience strong emotions, and sometimes might be suffering in silence. They aren’t particularly sociable, and cats who are housed with others who weren’t litter-mates — perhaps by well-meaning owners who think they need the company — can become chronically stressed.
Luckily, then, cats probably aren’t aware that today they are once again hate-figures, the furry target of spittle-spraying ecologists who, armed with dodgy statistics, accuse cats of wildly “murdering” all the country’s songbirds. It’s a bit more complicated than that,Bradshaw shows. Rats also kill songbirds, and cats keep their numbers down; while the RSPB says the disappearance of habitat is a far more important factor in the decline of songbird populations than predator numbers. But we could at least, Bradshaw suggests, reverse the counterproductive selection pressure we currently exert on the domestic cat when we neuter house cats before they reproduce. This means,he explains, that the “friendliest, most docile” cats are prevented from leaving any descendants, while wild cats —which are more suspicious of humans and better at hunting— will leave more offspring. Unintentionally, we are causing cats to evolve into animals society won’t like as much
Cat-haters probably won’t appreciate this book, but anyone else might. It is written in a friendly and engaging way, has helpful tips for cat owners, and is packed with excellent cat facts. Why, you might have wondered, do cats get stuck up trees? Because all their claws face forwards, so none can be used as brakes on the descent. We all know how good cats are at twisting mid-air to land on their feet,but they have an even more impressive trick: some cats adopt a “parachute” position during a long fall, with all four legs stuck out to the side, before coming back to the landing position at the last moment. This cat-parachute pose,Bradshaw calculates, “limits the falling speed to a maximum of fifty-three miles an hour” so enabling some cats to fall from high-rise buildings and walk away unhurt. I’d like to see a dog try that.
According to the author,what i smost impressive about cats during a long fall in Bradshaw’s writing?
A.Cats can be trained to land safely.
B.Cats tend to use their claws as brakes.
C.Some cats can adopt a “parachute” position.
D.Most cats are good at playing tricks in mid-air.
[单选题]Mr. White wanted to park his car near the roadside but the police asked him __________.
A.not to do
B.not do
C.not to
D.do not
[单选题] The river near our village is about （）long.
A. three-hundreds-metres
B. three-hundred-metre
C. three-hundred-metres
D. three hundred metres
[单选题]_______ a windshear near the ground on final.
A.It has
B.There is
C.There has
D.It is
[单选题]Hazardous wind shear is commonly encountered near the ground _______ .
A.around the stratocumulus clouds
B.during periods of strong temperature inversion and near thunderstorms
C.during periods of the frontal inversion, and near the jet stream
D.either B or C
