Developing a bad habit is easier than many might think. " You can become addicted potentially anything you do," says Mark【S1】___

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问题     Developing a bad habit is easier than many might think. " You
can become addicted potentially anything you do," says Mark【S1】______
Griffiths, an addiction researcher at Nottingham Trent University in
the UK, "because addictions rely in constant rewards. " Indeed,【S2】______
although definitions of addiction vary, there is a body of evidence
that suggests drug addictions and non-drug habits should share the【S3】______
same neural pathways. While only a hardcore few can be considered
true technology addicts, an entirely unscientific survey of the web,
and of New Scientist staff, has revealed what prevalent techno-【S4】______
addictions may have become.
    The web at particular has opened up a host of opportunities for【S5】______
overindulgence. Take Wikipedia. Updating the entries—something
anyone can do—has become almost a way of life for some. There
are more than 2,400 "Wikipedians" , which have edited more than【S6】______
4,000 pages each. "It’s clearly like crack for some people," says
Dan Closely at Cornell University in New York, who has studied
how websites such as Wikipedia foster a community. To committed
Wikipedians, he says, the site is less than a useful information【S7】______
resource; it’s the embodiment of an ideology of free information
for all.
    E-mail is another area where things can get out of the hand.【S8】______
While e-mail has led to a revival of the habit of penning short notes
to friends and acquaintances, the ease with that we can do this【S9】______
means that we don’t always think hard enough about where our
casual comments could end up. This was the undoing of U. S.
broadcaster Keith Olbermann, who earlier this year sent a private
e-mail which he described a fellow MSNBC reporter as "dumber【S10】______
than a suitcase of rocks". Unfortunately for Olbermann, the words
found their way into the New York Daily News.
【S6】

选项

答案which—who

解析 关系代词误用。这是一个非限制性定语从句,先行词是Wikipedians,表示一类人,因此关系代词应该使用who。
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