题型:阅读理解 题类:常考题 难易度:普通
四川省成都市双流中学东校区2017-2018学年高二下学期英语期末适应性考试试卷考试试卷
The vast majority of us spend our entire lives pulled down by gravity. Then there are astronauts.
This small population of space travelers has given researchers a rare look at what happens to the human body when it's able to spend large amounts of time outside the downward pull of the Earth. This week, a study on one of the largest groups of astronauts yet —34 participants—was published in The New England Journal of Medicine.
In the new study, a team of international radiologists supported by NASA looked at MRIs of the brains of astronauts before and after their trips to space. The scientists found that upon returning to Earth, many of the astronauts' brains had become repositioned inside their skulls, floating higher than before. In addition, the space between certain brain areas appeared to have shrunk. The changes were more common in astronauts who took longer trips into space.
The team characterized astronaut trips as short (an average of less than 14 days) or long (an average of about 165 days). Radiologists who didn't know each astronaut's duration(持续时间)in space compared MRIs from before and after their trips.
Of the 34 total astronauts involved in the study, 18 took long trips to space—spending most of that time on the International Space Station —and of those, 17 returned to Earth with smaller areas between the frontal lobe(脑前额叶)and parietal lobe(顶叶). The same area of the brain also shrank for three of the 16 astronauts who took shorter trips with the US Space Shuttle Program. The researchers also found that 12 of the ISS astronauts and six of the space-shuttle astronauts returned home with their brains sitting slightly higher in their skulls than before.
It's not clear what, if anything, these brain changes mean for the health of space travelers. In general, it appears the human body tolerates space travel fairly well: the time astronauts have spent in zero-gravity environments so far doesn't seem to have had any strong or long-lasting effects.
Real Simple First Issue: 2000 Published: Monthly Real Simple is a lifestyle title owned by Time, Inc. This magazine covers topics from decorating and dieting to childcare and product guides. Like many lifestyle magazines, Real Simple is written with women in mind, but that doesn't mean men can't get something out of it! This one is especially good tor people who like to organize and simplify their lives. As the title implies, simple, authentic (真实的)living is the magazine's main theme. |
Better Homes and Gardens First Issue: 1922 Published: Bi-Monthly Better Homes and Gardens is a household name when it comes to lifestyle magazines ten around since 1922, so the title has a long history of providing high quality, useful content. Decorating and gardening, as the title suggests, are common topics in the magazine, but it is also known for its excellent recipes. |
Woman's Day First Issue: 1937 Published: Monthly If you're looking for a magazine that combines lifestyle and fashion content, Woman's Day might be a good choice. It has a readership of over 3 million women across the United States. Some of its unique characteristics include its focus on traditional values and its commitment to giving womenrealistic advice. Many magazines feature lifestyles that are out of reach for the major of American families, but Woman's Day tries to give practical advice and suggestions that its real-world readers can put into practice. |
Taste of Home First Issue: 1993 Published: Bi-Monthly For people who want a magazine that's entirely about cooking, recipes, nutrition, and other food-related content, Taste of Home has been a popular choice all the time. It has an unusually rich history of giving its readers what they want. The magazine only started including advertisements in 2007, before which it was advertisement-free. Now the magazine is doing pretty well financially. |
试题篮