题目内容
下列哪种物质对GnRH的分泌无影响
查看答案
搜索结果不匹配？点我反馈
更多问题
GnRH的作用是：
The media have become fond in recent years of glamorizing stay-at-home moms as elite career women who have "opted out" of the workforce so they can put family first. Finally, thePew Research Center has provided the reality check we’ve needed. "The share of mothers who do not work outside the home rose to 29% in 2012, up from a modern-era low of 23% in 1999," Pew’s new report finds. The primary reason: economics. The cost of child care and the lack of job opportunities are forcing women to stay at home rather than go back to work after having kids. Affluent(富裕的) stay-at-home moms who’ve chosen to leave the workforce to raise their families often get the media spotlight, but they make up a small percentage—5%, according to Pew—of women in the U.S. These are not women whose families struggle to make ends meet when both parents are employed. These are parents who have the financial means to "put family first" by being at home. The problem with the media obsession with the rich stay-at-home morn is that these stories overshadow the fact that most stay-at-home moms are, in fact, poor. Pew found that a startling 34% of stay-at-home moms are living in poverty. The Pew report also attributes the rising costs of child care to the increase in stay-at-home moms. The Washington Post published a map last week that shows the cost of full-time infant day care in 31 states actually exceeds the cost of state college tuition. At the top of the list is Massachusetts, where the annual cost of having an infant in full-time day care is about $16,000. By contrast, a year at a public college in Massachusetts costs about $10,000. While the numbers are certainly alarming, it is a relief to see the media briefly turn away from the "mommy wars" that focus solely on the decisions of the privileged few to talk about the rest of us trying to raise families. It’s difficult to make the case for policy changes that could make day care more affordable if we never hear about how families are struggling with the costs. Until we have policies that can start to reel in the cost of high-quality child care or help low-income moms gain skills to boost their earning potential, we’ll continue to see these numbers rise. What do we know about the resigned rich stay-at-home moms from the passage
在黄体细胞中，氧自由基可：
Academic Journals: The Most Profitable Obsolete(过时的)Technology in History A. The music business was killed by Napster; movie theaters were derailed by digital streaming; traditional magazines are in crisis mode—yet in this digital information wild west: academic journals and the publishers who own them are posting higher profits than nearly any sector of commerce. B. Academic publisher Elsevier, which owns a majority of the influential academic journals, has higher operating profits than Apple. In 2013, Elsevier posted 39 percent profits, according to Heather Morrison, assistant professor at the University of Ottawa’s School of Information Studies in contrast to the 37 percent profit that Apple displayed. C. This lucrative nature of academic publishing comes at a price—and that weight falls on the shoulders of the full higher education community which is already bearing the burden of significantly decreasing academic budgets. "A large research university will pay between $3-3.5 million a year in academic subscription(订阅)fees—the majority of which goes to for-profit academic publishers," says Sam Gershman, a postdoctoral fellow at MIT who assumes his post as an assistant professor at Harvard next year. In contrast to the exorbitant prices for access, the majority of academic journals are produced, reviewed, and edited on a volunteer basis by academics who take part in the tasks for tenure and promotion. D. "Even the Harvard University Library, which is the richest university library in the world, sent out a letter to the faculty saying that they can no longer afford to pay for all the journal subscriptions," says Gershman. While this current publishing environment is hard on large research institutions, it is wreaking havoc(造成大破坏) on small colleges and universities because these institutions cannot afford access to current academic information. This is clearly creating a problematic situation. E. Paul Millette, director of the Griswold Library at Green Mountain College, a small 650 student environmental liberal arts college in Vermont, talks of the enormous pressures access to academic journals have placed on his library budgets. "The cost-of-living has increased at 1.5 percent per year yet the journals we subscribe to have consistent increases of 6 to 8 percent every year." Millette says he cannot afford to keep up with the continual increases and the only way his library can afford access to journal content now is through bulk databases. Millette points out that database subscription seldom includes the most recent, current material and publishers purposefully have an embargo of one or two years to withhold the most current information so libraries still have a need to subscribe directly with the journals. "At a small college, that is what we just don’t have the money to do. All of our journal content is coming from the aggregated database packages—like a clearing house so to speak of journal titles," says Millette. F. "For Elsevier it is very hard to purchase specific journals—either you buy everything or you buy nothing," says Vincent Lariviere, a professor at University of Montreal. Lariviere finds that his university uses 20 percent of the journals they subscribe to and 80 percent are never downloaded. "The pricing scheme is such that if you subscribe to only 20 percent of the journals individually, it will cost you more money than taking everything. So people are stuck." Where To Go: G. "Money should be taken out of academic publishing as much as possible. The money that is effectively being spent by universities and funding agencies on journal access could otherwise be spent on reducing tuition, supporting research, and all things that are more important than paying corporate publishers," says Gershman. John Bohannon, a biologist and Science contributing correspondent, is in agreement and says, "Certainly a huge portion of today’s journals could and should be just free. There is no value added in going with the traditional model that was built on paper journals, with having people whose full time job was to deal with the journal, promote the journal and print the journal, and deal with librarians. All that can now be done essentially for free on the internet." H. Although the prior clearly sounds like the path toward the future, Bohannon says from his vantage point the prior is not one-size-fits-all: "The most important journals will always look pretty much like they do today because it is actually a really hard job." Bohannon finds that the more broad journals such as Science, Nature, and Proceeding of the National Academy of Science (PNAS) will always need privatized funding to complete the broad publication tasks. Another Option I. "A better approach to academic publishing is to cut out the whole notion of publishing. We don’t really need journals as traditionally conceived. The primary role of traditional journals is to provide peer review and for that you don’t need a physical journal—you just need an editorial board and an editorial process," says Gershman. J. As higher education is redefined to meet the needs and affordability required of the 21st century certainly the most basic functions of sharing academic research need to be retooled. There is no reason an academic publisher should have such a significantly different economic picture from standard publishers. The stark contrast is troubling as it tells just how far from reality our higher education system has traversed. Correspondingly, there is no reason universities should pay $3.5 million to have access to peer-reviewed data. This academic conversation is society’s conversation—and it is time that the digital revolution level one last playing field: because we, the people, deserve access. John Bohannon finds that money is needed for some broad journals to finish the broad publication tasks.
微信支付 
支付宝支付