Questões de Concurso Sobre inglês
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Solar System’s Water is Older Than the Sun
Next time you’re swimming in the ocean, consider this: part of the water is older than the sun.
So concludes a team of scientists who ran computer models comparing the ratios of hydrogen isotopes over time. Taking into account new insights that the solar nebula had less ionizing radiation than previously thought, the models show that at least some of the water found in the ocean, as well as in comets, meteorites and on the moon, predate the sun’s birth.
The only other option, the scientists conclude, is that it formed in the cold, intersteller cloud from which the sun itself originated.
The discovery, reported in this week’s Science, stems from the insight of lead author Lauren Ilsedore Cleeves, a doctoral student at the University of Michigan, who realized that planetforming disks around young stars should be shielded from galactic rays by the strong solar winds, dramatically altering the chemistry occurring inside the disks, said Conel Alexander, with the Carnegie Institution of Washington.
“The finding... makes it quite hard for these regions in the disk to synthesize any new molecules. This was an ‘aha’ moment for us – without any new water creation the only place these ices could have come from was the chemically rich interstellar gas out of which the solar system formed originally,” Cleeves wrote in an email to Discovery News.
“It’s remarkable that these ices survived the entire process of stellar birth,” she added.
The finding has implications for the search for life beyond Earth, as water is believed to be necessary for life.
“If the sun’s formation was typical, interstellar ices – including water – are likely common ingredients present during the formation of all planetary systems, which puts a wonderful outlook on the possibility of other life in the universe,” Cleeves said.
In addition, it’s not just water that likely survived the solar system’s birth.
“The same must be true for the organic matter that we know is present in molecular cloud ices. So I think this strengthens the case that we have interstellar organic matter in meteorites and comets too,” Alexander wrote in an email to Discovery News.
Available in: http://news.discovery.com
Read the sentence taken from the text.
“The finding has implications for the search for life beyond Earth, as water is believed to be necessary for life.”
Choose the alternative in which the underlined word is conjugated in the same verb tense as the one above.
According to the text:
Building a Practical College Degree for the New Economy
This is not a great time to be a recent college graduate.
Average student-loan debt is $29,400. The underemployment rate is 44 percent for graduates ages 22 to 27, meaning they are holding jobs that don’t require bachelor’s degrees. And the average age of financial independence for college graduate these days is 30.
Such statistics have given rise to the narrative that a college degree is no longer worth it, although volumes of economic studies on lifetime earnings prove otherwise. Even so, given the number of college graduates struggling to launch their careers, a wide gap has emerged between what the workforce needs in employees and what colleges are producing in graduates.
Part of the problem is that we have high expectations for the bachelor’s degree today. Thirty years ago, when fewer people required a higher education to get ahead in life, the bachelor’s degree was seen as a vehicle for broad learning. The training part came later by going to graduate school or getting a job where the new employer trained you.
Now we demand that skills training move in tandem with broad learning, and expect both to be completed in the four years of an undergraduate education. For too many students, however, the bachelor’s degree is not providing that dual experience – high-impact, in-classroom learning and out-of-theclassroom, experiential, and hands-on learning necessary for success in today’s economy.
Because of student loan debt, graduate or professional school is no longer an option for many recent college graduates. They’re searching for quick and cheap addon boot camps that give them what they’re missing. And a whole new set of providers are emerging outside of the traditional higher-education ecosystem to provide that lift.
Last year, General Assembly, which offers courses of a few hours to a few weeks in everything from digital marketing to web development, expanded to Washington, DC, where it is selling out of nearly all of its offerings. Its average student is in his mid-20s and just a few years out of college.
According to the text,
I. colleges are not producing in graduates what the workforce needs in employees.
II. nowadays, the bachelor’s degree is seen only as a vehicle for broad learning.
III. nearly 44% of graduates ages 22 to 27 hold jobs that require bachelor’s degree.
IV. colleges are expected to give students not only skills training, but also broad learning.
V. economic studies on lifetime earnings prove a college degree is no longer worth it.
The correct assumption(s) is(are)
Since the 1950’s, some athletes have been taking anabolic steroids to build muscle boost their athletic performance. Increasingly, other segments of the population also have been taking these compounds. An anual survey of drug abuse among adolescents showed a significant increase from 1998 to 1999 in steroid abuse among middle school students. During the same year, the percentage of 12th-graders who believed that taking these drugs causes “great risk” to health, declined from 68 percent to 62 percent.
Studies show that, over time, anabolic steroids can indeed take a heavy toll on a person’s health. The abuse of oral or injectable steroids is associated with higher risks for heart attacks and strokes, and the abuse of most oral steroids is associated with increased risk for liver problems. Steroid abusers who share needles or use non-sterile techniques when they inject steroids are at risk os contracting dangerous infections, such as HIV/AIDS, hepatites B and C, and bacterial endocarditis.
Anabolic steroid abuse can also cause undesirable body changes. These include breast development and genital shrinking in men, masculinization of the body in women, and acne and hair loss in both sexes.
[...] We hope that this compilation of scientific information on anabolic steroids will help the public recognize the risks of steroid abuse.
Alan I. Leshner, Ph.D. Director National Institute on Drug Abuse www.nida.nih.gov
Check the meaning of the word in bold.
- The abuse of steroids is associated with risks for heart attacks and strokes.
De acordo com o texto, assinale com V (verdadeiro) ou F (falso) as afirmativas abaixo.
( ) Ganhos financeiros não são os únicos objetivos do crime cibernético.
( ) Os Cavalos de Troia são o único programa que não pode destruir toda uma rede de computadores.
( ) Desde início dos anos 90, o compartilhamento de sítios de músicas já se fazia violando a lei.
( ) A disseminação de material sujeito a direitos autorais, sem autorização do proprietário, é considerada pirataria.
A sequência correta do preenchimento dos parênteses, de cima para baixo, é
Leia as frases abaixo:
I - Conseguir informações valiosas.
II - Burlar as medidas de segurança do governo ou corporações.
III - Gastar dinheiro.
De acordo com o texto, qual/quais se refere(m) aos principais objetivos do crime cibernético?

