외국어(영어) 석사 자격시험 교재 단어학습 참고자료 unit 1 Sports and Fitness

While excavating a cave on the Indonesian island of Flores, archeologists made an astonishing and unexpected find: a very unusual human skeleton.

The remains were definitely human, but the body was only about one meter (three feet) long – about the size of a modern three-year-old.

While excavating a cave on the Indonesian island of Flores, archeologists made an astonishing and unexpected find: a very unusual human skeleton.

The team transported the skeleton back to Jakarta (the capital of Indonesia) for closer inspection.

He determined that the human was a female, and contrary to what archeologists first thought, that she was an adult, not a child.

Her forehead and jaw were similar to those of an earlier type of human, Homo erectus, but her size was unique – unlike any other human archeologists had ever seen.

Perhaps, scientists suggested, this was a modern human who had suffered from a rare disease which caused her body to develop abnormally.

One of the first was, where did this species come from?

Scientists believe thousands of years of isolation on Flores could have caused the people to shrink – especially if they had no natural predators, which would make physical size and strength less important.

시키다

Minimizing food consumption and adapting in size were necessary for Homo floresiensis to survive – a phenomenon often seen in nature.

Minimizing food consumption and adapting in size were necessary for Homo floresiensis to survive – a phenomenon often seen in nature.

Nevertheless, it is possible that people like us (who were already living in Australia and parts of Asia 40,000 years ago) met their tiny human cousins.

Some scientists have suggested that a conflict between the two human species may have caused Homo floresiensis to die out.

More likely, though, is that the tiny humans became extinct as a result of a major volcanic eruption.

To stay awake and focused, he’s had two cups of coffee in the last three hours ad is now downing a popular energy drink.

Many students like Murphy, as well as marathon runners, airline pilots, and long-distance travelers, owe their energy – and sometimes their efficiency – to one of mankind’s oldest stimulants: caffeine.

The power to counter physical fatigue and increase alertness is part of the reason caffeine ranks as the world’s most popular mood-altering drug.

A number of scientists, including Roland Griffiths, a professor at the Johns Hopkins School of Medicine in the U.S., believe that regular caffeine use cause physical dependence.

Heavy caffeine users, Griffith says, exhibit similar behaviors: their moods fluctuate from high to low.

Their moods fluctuate from high to low.

They get mild to severe headaches.

Furthermore, a lot of current research contradicts long-held negative beliefs about caffeine, and suggests that it may, in fact, have health benefits.

Because it fights fatigue, it facilitates performance on tasks like driving, flying, and solving simple math problems.

And while it is true that caffeine can increase blood pressure, the effect is usually temporary and therefore not likely to cause heart trouble – especially if caffeine is consumed in moderation.

And despite its nearly universal use, caffeine has rarely been abused.

Despite modern society’s heavy dependence on fossil fuels for energy, most people are aware that the supply of these fuels is finite.

But which substitute – if any – is the right one?

Solar panels catch energy directly from the sun and convert it into electricity.

자

Also, unlike other energy sources, solar power from space will last as long as the sun shines, and will be able to guarantee everyone on Earth all the energy they need.

All over Europe, incentives designed to decrease the dependence on oil and coal have led to a steep increase in wind-powered energy.

Today, Europe leads the world in wind power, with almost 35,000 megawatts, the equivalent of 35 large coal-powered

If the wind doesn’t blow, the turbines don’t have the capacity to produce sufficient energy.

Nuclear power produces vast amounts of electricity more cheaply than gas or coal, with no carbon emissions.

For a number of years in the 1980s and ‘90s, however, use of nuclear power declined due to accidents, concerns about nuclear waste storage and disposal, and high construction costs.

For a number of years in the 1980s and ‘90s, however, use of nuclear power declined due to accidents, concerns about nuclear waste storage and disposal, and high construction costs.

China has started to build one or two new plants a year, and Japan and India have also begun to utilize nuclear energy on a large scale.

대안

Though there are still concerns about the safety of nuclear power, many now believe it may be one of the future’s greenest energy alternatives.

The short answer is no, but used in some combination – along with other power sources – we may find ways to reduce and eventually eliminate our dependence on fossil fuels.