[简答题]Things aren’t always as they appear, a fact of life confirmed for me firsthand in 1990, just after I received my Ph.D. in physics. I had just started a temporary postdoctoral position at a major laboratory and had the opportunity to talk with scientists whose postdoctoral fellowships were ending. 21) Although my advisers had warned me that finding a permanent position in science would be difficult, what I discovered was shocking — even the best young scientists I knew were having difficulty securing permanent employment. So it was both puzzling and disturbing to see press reports claiming that America didn’t have enough scientists.
These alarming reports were epidemic in 1990. Frequently the news stories had hyperbolic headlines like SHORTAGE OF SCIENTISTS APPROACHES A CRISIS AS MORE STUDENTS DROP OUT OF THE FIELD, and they often quoted National Science Foundation (NSF) officials. 22) For a government obsessed with international competitiveness, stories of a shortage o

[单项选择]In the digital realm, things seem always to happen the wrong way round. Whereas Google has hurried to scan books into its digital catalogue, a group of national libraries has begun saving what the online giant leaves behind. For although search engines such as Google index the web, they do not archive it. Many websites just disappear when their owner runs out of money or interest, Adam Farquhar, in charge of digital projects for the British Library, points out that the world has in some ways a better record of the beginning of the 20th century than of the beginning of the 21st.
In 1996 Brewster Kahle, a computer scientist and internet entrepreneur, founded the Internet Archive, a non-profit organisation dedicated to preserving websites. He also began gently harassing national libraries to worry about preserving the. web. They started to pay attention when several elections produced interesting material that never touched paper.
In 2003 eleven national librari
A. New problems arise from the development of the digital technology.
B. Google should save all the books in its web.
C. Websites should be kept for ever.
D. Things turn out to be wron

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Like so many things of value, truth is not always easy to come by. What we regard as true shapes our beliefs, attitudes, and actions. Yet we can believe things that have no basis in fact. People are capable of embracing horrific precepts that seem incredible in retrospect. In Nazi Germany, Adolf Hitler had millions of followers who accepted his delusions about racial superiority. As Voltaire put it long before Hitler’s time, "Those who can make you believe absurdities can make you commit atrocities. "
We are surrounded by illusions, some created deliberately. They may be subtle or may affect us profoundly. Some illusions, such as films and novels, we seek out and appreciate. Others can make us miserable and even kill us. We need to know if particular foods that taste perfectly fine can hurt us in the short term (as with Salmonella contamination) or in the long term (cholesterol), whether a prevalent virus is so dangerous that we should avoid public places,
A. truth is hard to get due to misconceptions
B. public health deserves much attention
C. political elections have profound impact
D. illusions are helpful in gaining new insights