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A new survey by Harvard University finds more than two-thirds of young Americans disapprove of President Trump ’s use of Twitter. The implication is that Millennials prefer news from the White House to be filtered through other source, Not a president’s social media platform. Most Americans rely on social media to check daily headlines. Yet as distrust has risen toward all media, people may be starting to beef up their media literacy skills. Such a trend is badly needed. During the 2016 presidential campaign, nearly a quarter of web content shared by Twitter users in the politically critical state of Michigan was fake news, according to the University of Oxford. And a survey conducted for BuzzFeed News found 44 percent of Facebook users rarely or never trust news from the media giant. Young people who are digital natives are indeed becoming more skillful at separating fact from fiction in cyberspace. A Knight Foundation focus-group survey of young people between ages 14and24 found they use “distributed trust” to verify stories. They cross-check sources and prefer news from different perspectives—especially those that are open about any bias. “Many young people assume a great deal of personal responsibility for educating themselves and actively seeking out opposing viewpoints,” the survey concluded. Such active research can have another effect. A 2014 survey conducted in Australia, Britain, and the United States by the University of Wisconsin-Madison found that young people ’s reliance on social media led to greater political engagement. Social media allows users to experience news events more intimately and immediately while also permitting them to re-share news as a projection of their values and interests. This forces users to be more conscious of their role in passing along information. A survey by Barna research group found the top reason given by Americans for the fake news phenomenon is “reader error,” more so than made-up stories or factual mistakes in reporting. About a third say the problem of fake news lies in “misinterpretation or exaggeration of actual news” via social media. In other words, the choice to share news on social media may be the heart of the issue. “This indicates there is a real personal responsibility in counteracting this problem,” says Roxanne Stone, editor in chief at Barna Group. So when young people are critical of an over-tweeting president, they reveal a mental discipline in thinking skills – and in their choices on when to share on social media. The Barna survey found that a main cause for the fake news problem is
A.
readers outdated values.
B.
journalists ’ biased reporting
C.
readers ’ misinterpretation
D.
journalists ’ made-up stories.
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【单选题】参数为c的指数分布概率密度函数p(x),×≥0时p(x)=c exp(-c x); 否则p(x)=0,若一个随机变量Y服从参数为c的指数分布,则在一次随机试验中,概率P(Y≥1/c)等于 ( )
A.
1/e
B.
2/e
C.
3/e
D.
1/2
【单选题】影响舵效的主要因素是()。 ①舵角大小; ②流经舵面的流速; ③船的转动余速; ④风流、浅水等海况; ⑤舵机性能。
A.
①②③④
B.
②③④⑤
C.
①③④⑤
D.
①②④⑤
【单选题】影响舵效的主要因素是() ①舵角大小; ②流经舵面的流速; ③船的转动惯性及纵横倾; ④风流、浅水等海况; ⑤舵机的性能。
A.
①~④
B.
②~⑤
C.
①③④⑤
D.
①~⑤
【判断题】交易动机的货币需求和投机动机的货币需求都是收入的递增函数,而预防动机的货币需求则是利率的递减函数。
A.
正确
B.
错误
【判断题】当没有开锁动作时,开锁装置应自动保持在锁紧状态。( )
A.
正确
B.
错误
【简答题】设X的概率密度函数为: (x>0, V>0), 若Y1,Y2,...,Ym独立且同服从指数分布E(λ),令X=Y1+Y2+...+Ym, 则X服从n阶爱尔朗分布.请采用卷积法生成爱尔朗分布的随机变量.
【判断题】当没有开锁动作时,开锁装置应自动保持在锁紧状态。( )
A.
正确
B.
错误
【判断题】投机动机的货币需求是利率的减函数。
A.
正确
B.
错误
【单选题】若随机变量X的密度函数为 则X服从( )分布
A.
N(1,2)
B.
N(1,1)
C.
N(2,2)
D.
N(0,1)
【单选题】影响舵效的主要因素是()。 ①舵角大小; ②操舵舵轮速度; ③船的转动惯性及纵横倾; ④风流、浅水等海况; ⑤舵机的性能。
A.
①②③④
B.
②③④⑤
C.
①③④⑤
D.
①②④⑤
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