"According to such-and-such, a think-tank," is a phrase familiar to readers of any newspaper. Sharp quotes, intriguing facts and

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问题     "According to such-and-such, a think-tank," is a phrase familiar to readers of any newspaper. Sharp quotes, intriguing facts and bold new policy proposals are 【C1】______ the mysterious tanks. What exactly are these outfits, 【C2】______ churn out reports on everything from Brexit to badgers?
    The "think-tank" label became popular in the 1950s, 【C3】______ which time there were already plenty of such organizations in existence. Many of America’s most 【C4】______ tanks were founded in the early 20th century. But think-tanks really 【C5】______ in the second half of the 20th century.
    Think-tanks 【C6】______ fill the gap between academia and policymaking. Academics 【C7】______ authoritative studies, 【C8】______ at a snail’s pace. Journalists’ first drafts of history are 【C9】______ but thin. A good think-tank helps the policymaking process by publishing reports that are as 【C10】______ as academic research and as accessible as journalism. They 【C11】______ in the 20th century for two reasons. Governments were expanding everywhere, meaning there was lots of 【C12】______ for policy expertise. And the arrival of 24-hour news created an insatiable appetite 【C13】______ informed interviewees. The same trends are now causing think-tanks to 【C14】______ in developing countries.
    【C15】______ the world may have reached peak tank. The Pennsylvanian researchers found that in 2014 the number of new tanks 【C16】______ for the first time in 30 years. One reason is that donors nowadays prefer to make project-specific grants, 【C17】______ funneling money into mere thinking. 【C18】______ is increased competition. So some tanks are rethinking themselves. The Pew Research Centre describes itself as a "fact tank" , 【C19】______ information rather than policy recommendations. And the Sutton Trust calls itself a "do tank", putting its own recommendations into 【C20】______.
【C3】

选项 A、by
B、until
C、at
D、before

答案A

解析 语义辨析题。根据上下文可知,到20世纪50年代已经存在大量的这类机构,表示截至这一时间点应该用A项by。
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