题目内容：
根据下列材料，回答问题。In the past decade, new scientific developments in communications have changed the way many people gather information about politics. The most important of these new 21 is the Internet. Recent research suggests the use of the Internet for political information increases the 22 of participation.
While a (n) 23 relationship between Internet news and political participation has been found, a theoretical link as to why the Internet is 24 from other media forms is largely 25 This research is an attempt to 26 the "black-box" linking the Internet and political participation by building on two theoretical 27 . The first, surge and decline theory, comes out of political science and the second, media systems dependency theory, 28 from communications. Both explanations focus on individual costs and benefits of political participation. The media can 29 the "costs" by providing sufficient information to make 30 decisions about voting. Previous research 31 that the Internet benefits the public through the cost side of the equation. One of the media's greatest 32 is information and the public 33 on media to provide them with the in-formation they need. 34 the Internet is capable of providing information 35 , and from a multitude of sources, one would expect it to 36 political action through lowering the cost of information.
Besides lowering participation costs, the media can 37 increase the benefits of participation. Intense media 38 of an event such as an election can 39 excitement that increases the perceived "benefit" of participating. The Internet may encourage a unique participation benefit 40 increased mobilization efforts.
A．technologies
B．materials
C．concepts
D．devices
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