My friend's ten-year-old daughter Julia has a new hobby. Like ma

My friend's ten-year-old daughter Julia has a new hobby. Like many of her school pals, she hopes to become a video blogger—a "vlogger”. She's started to record clips of herself for others to watch and "like". She showed me a few, and then gave me a list of famous vloggers to watch. Their names sounded so bizarre. But they are totally familiar to teenage girls.
Like an earnest marketing executive, Julia explained to me that it was all a matter of numbers. If her videos are viewed 40,000 times on YouTube, she can have advertisements placed on them; 100,000, and companies would start sending her products to promote. One million and she'd be a YouTube star.
This seemed a peculiar phenomenon but Julia is not alone. In fact, her dream is perfectly normal for her generation: one in three children between the ages of 11 and 16 have uploaded a video to YouTube. Who can blame them? Vlogging can now be a well-paid career. Unlike the more traditional dream jobs—pop star, doctor, footballer, scientist—it doesn't take much effort. All it requires is a smartphone and gallons of youthful self-confidence.
There're plenty of people with that. The 27-year-old British vlogger Zoella has made millions from her channel. Ryan, the six-year-old American host of the YouTube channel RyanToysReview, made £8.5 million last year from reviewing toys and sweets.
Popular genres on YouTube are the "haul video"—where a vlogger reviews recently received items—and the "unboxing video", in which products are opened and then discussed. The message is: "I've got this, and you haven't." And then comes, “here's where to buy it”. What the vloggers seem to have worked out is that the internet is a giant sales opportunity.
Not every girl can be Zoella, so the real winners are the tech companies, who are constantly improving their systems to extract the maximum revenue from their audiences. They are keen to show their desire to help protect children from the darker areas of the internet. "YouTube Kids" is an app （应用软件）which is meant to filter out inappropriate videos, but that is easier said than done. Algorithms （计算程序）haven't yet developed the moral sense to know what is good for children.
My friend said she was concerned about her daughter's vlogging but that it was difficult to intervene, for most girls in her class were obsessed with it. The girls all hope they might earn millions, travel the world and become famous.
20. What does the author say about "YouTube Kids"?
A、It is a shield against public criticism.
B、It is an instrument for making profit.
C、It is complex for children to handle.
D、It is unable to do what it is meant to.
【正确答案】：D
【题目解析】：文章倒数第二段提到"YouTube Kids" is an app （应用软件）which is meant to filter out inappropriate videos, but that is easier said than done. Algorithms （计算程序）haven't yet developed the moral sense to know what is good for children. “YouTube Kids”是一个应用程序，旨在过滤掉不合适的视频，但这说起来容易做起来难。算法还没有发达到知道在道德意义上什么是对孩子有益。选项A 它是抵御公众批评的盾牌，文中没有这种说法；选项B 它是一种赚钱的工具，文中没有提到是否盈利；选项C 这对孩子来说是复杂的，文章是说过滤掉不合适的视频是很难的，并不是说对孩子来说是复杂的；选项D它不能做它应该做的事，符合文意，故选D。