为整顿和规范税收秩序，营造依法纳税的良好氛围，某省国税稽查部门以打击发票违法犯罪活动和开展税收专项检查为重点，以重大案件查处为突破口，共检查纳税人4394户，实现整体查补30.83亿元，其中初查税收19.74亿元，入库税收14.28亿元。对14名主要涉案人员分别判处了1至5年的有期徒刑。

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已知x²-6x+ k²是一个完全式，则k的值是（ ）

（ A ）

    Apple Inc.'s iPhones may be the most popular mobiles in the world now. Not only adults use them,but little children also like them.

    Natasha Shykes is a mother of two kids in America.When her daughter, Kelsey, was only two years old, she became interested in her father's iPhone. “She pressed the button (按钮) and the phone lit up.It seemed to be amazing for her,” said Natasha. “Then she got serious about the phone. She always cried for it. It seemed that she also wanted an iPhone.”

    Apple Inc.'s iPhones are easy to use. So it is not difficult for little children to use them.Many applications (应用软件) on iPhones are designed for children who are too young to go to school. For example, children can learn more about the animals in the world by watching the videos on the phones.

    However, parents are very worried about this. They don't know whether they should buy their children iPhones or not. There are two main reasons. One is that they are afraid that children may destroy the iphones. Another reason is that they are not sure whether iPhones can really be used as educational tools.