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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."
【C19】
选项 A、games
B、transactions
C、experiences
D、friends
答案C
解析 上文提到孩子们上网和陌生人聊天并且存在危险，从to ensure they have safe online…(保证他们用安全的网络……)推断，父母和学校均是想确保孩子们网络上的安全。C项experiences“体验”表明确保孩子们有安全的网络体验，符合语义。A项games“游戏”，本文并未提到孩子们在网上玩游戏，与主题无关。B项transactions“交易”。无语义线索表明孩子们进行网络交易。D项friends“朋友”，在网上交朋友只是孩子上网的内容之一，语义狭窄。
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