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Australian children are visiting social media websites at an increasingly younger age, a new survey suggests, with one in five "

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问题     Australian children are visiting social media websites at an increasingly younger age, a new survey suggests, with one in five "tweens" (children between the ages of about 10 and 14) admitting they have chatted to someone online they do not know.
    The report "Tweens, Teens and Technology" by online security company McAfee fodnd that children in the tweens age【C1】________of 8 to 12 were【C2】________technology faster than expected, with 67 percent using a social media website.【C3】________the age eligibility for Facebook being 13, one in four (26 percent)【C4】________using the site— although 95 percent said they had their parents’【C5】________ to do so.
    The most【C6】________site for tweens was Skype (used by 28 percent),【C7】________children were also using Instagram, according to the survey of 500 youngsters geographically【C8】________of Australia’s online population.【C9】________the survey found that one in five tweens (19 percent) said they chatted to someone online that they did not know,【C10】________seven percent said they had shared personal information.
    Australia’s Communications Minister Stephen Conroy said it was【C11】________that children talk to strangers online. "It shows we must remain【C12】________to online threats," he said. The findings suggest the age at which children first use social media is【C13】________given a 2012 McAfee survey of teens aged 13-17 found the average age they opened their first social network【C14】________was 13. On average, tweens were using three or four devices that can be Internet【C15】________, with 66 percent of them【C16】________mobile phones and/or tablets. Fifty-four percent said they used a tablet for more than an hour a day.
    Most tweens use their devices to【C17】________the Internet, and on average spend about 1.5 hours a day browsing the web, the survey said. "Both parents and schools are encouraged to keep a close【C18】________on their child’s online behavior to ensure they have safe online【C19】________," said Andrew Littleproud, president of McAfee Asia-Pacific. "By working closely with child psychologists, we have seen that online behaviors firmly set in the tween age group so active education is【C20】________within eight to 12 age bracket."
【C13】
选项 A、falling
B、extending
C、rising
D、shortening
答案A
解析 文章一开始便表明少年儿童在接触社交网的年龄越来越小(at all increasingly younger age)，结合空格后提到2012年迈克菲发布调查结果：13～17岁青少年开通网络……的平均年龄是13岁，推测该句想表达的是青少年接触网络的年龄更小了。A项falling“下降，降低”，符合语义逻辑。B项extending“扩展，伸长”，接触网络的年龄在扩展，语义不通顺。C项rising“上升”，13～17岁青少年开通网络……的平均年龄是13岁，说明该年龄是非常小的，而不是上升。D项shortening“缩短”，指的是长度的缩短，但这里说的是年龄的大小。
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