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【单选题】
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 phrase “beer up”(Line 2, Para. 2) is closest in meaning to
A.
sharpen
B.
define
C.
boast
D.
share
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【单选题】一个直线光栅,每毫米刻线数为50,主光栅与指示光栅的夹角 β= 1.8,莫尔条纹的宽度为多少?
A.
0.524mm
B.
0.756mm
C.
0.637mm
D.
0.825mm
【简答题】选用过滤器在系统中可安装在 、 、 和单独的过滤系统中。
【判断题】有些病毒具有导致靶组织损伤的基因,如肝炎病毒亲肝基因,决不能用于重组活疫苗的研制。
A.
正确
B.
错误
【单选题】真核基因经常被断开的原因是()
A.
一个基因的不同部分分布于不同的染色体上
B.
外显子被内含子分隔
C.
多个初始转录产物才可连接成 mRNA
D.
mRNA 是多顺反子
【简答题】平带、V带传动主要依靠 来传递运动和动力。
【简答题】选用过滤器应考虑()和其他功能,它在系统中可安装在()、()、()和单独的过滤系统中。
【简答题】已知直线(k+1)x-y-3-3k=0(k∈R)所经过的定点F恰好是椭圆C的一个焦点,且椭圆C上的点到点F的最大距离为8. (Ⅰ)求椭圆C的标准方程;(7分) (Ⅱ)已知圆O:x 2 +y 2 =1,直线l:mx+ny=1.试证明当点P(m,n)在椭圆C上运动时,直线l与圆O恒相交;并求直线l被圆O所截得的弦长的取值范围.(8分)
【判断题】当线圈中的磁通量很大时,就有感应电流产生。
A.
正确
B.
错误
【单选题】一个直线光栅,每毫米刻线数为50,主光栅与指示光栅的夹角 β= 1.8,莫尔条纹的宽度为多少?
A.
0.524mm
B.
0.636mm
C.
0.756mm
D.
0.825mm
【单选题】一个直线光栅,每毫米刻线数为 50 ,主光栅与指示光栅的夹角 β= 1.8 ,莫尔条纹的宽度为多少?
A.
0.636mm
B.
0.524mm
C.
0.756mm
D.
0.825mm
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