【解析】选D。推理判断题。结合倒数第二段的But Rebecca Flanagan wonders which ones the district will use. . . The disconnect is between giving students an iPad to use and then making it relevant for the classroom可知, 他认为问题是网络的连接性还达不到标准, 有的孩子无法使用iPad同网络进行连接, 故选D。

　　B

　　As many people hit middle age, they often start to notice their memory and mental clarity are not what they used to be. We suddenly can’t remember where we put the keys just a moment ago, or an old acquaintance’s name, or the name of an old band we used to love. As the brain fades, we refer to these occurrences as“senior moments”.

　　This loss of mental focus can potentially have a disadvantageous effect on our professional, social, and personal well-being.

　　It happens to most of us, but is it inevitable(不可避免的)?

　　Neuroscientists are increasingly showing there’s actually a lot that can be done. It turns that the brain needs exercise in much the same way our muscles do, and the right mental exercise can significantly improve our basic cognitive functions. Thinking is essentially a process of making neural connections in the brain. Scientists believe intelligence can expand according to mental effort and practice.

　　Now, a new San Francisco Web-based company has taken it a step further and developed the first“brain training program”to help people regain their mental sharpness. Called Lumosity, it was designed by some of the leading experts in neuroscience and cognitive psychology from Stanford University.

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