The study findings are particularly useful as smart phones and mobile devices have become increasingly popular among families and parents are faced with a proliferation of mobile apps designed for kids. According to a recent Nielsen study, smart phone usage is 12% higher in households with children than other households.

　　“Mobile apps can be a great learning tool in the hands of children,” said Lesli Rotenberg, SVP, Children’s Media, PBS. “This research is important in helping to better understand and guide the development of new apps that improve the value of children’s screen time with significant educational outcomes.”

　　So what does it all mean? Well, at the very least it will help parents get over that guilty feeling when they hand over their iPhone or iPod Touch for a little peace and quiet. At best, it provides more evidence that mobile devices and apps do indeed have educational value and could be an important part of the child-learning process for many years to come.

　　68.What Lesli Rotenberg said in the fifth paragraph suggests that

　　.

　　A. he has a positive attitude towards mobile apps

　　B. he thinks children should never use smart phones

　　C. he is doubtful about mobile apps designed for children

　　D. he thinks parents should be careful with mobile apps for children

　　69.The underlined sentence in the last paragraph implies that

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