根据短文内容，选择正确答案。

    Computers are useful machines. They can help people a lot in their everyday life. For example, they can help people save much time, and they can help people work out many problems they can't do easily. Our country asks everyone to learn to use computers except the old people.

    Today more and more families own computers. Parents buy computers for their children. They hope computers can help them improve their studies in school. Yet many of the children use computers to play games, to watch videos or to sing Karaoke, instead of studying. So many teachers and parents complain (抱怨）that computers cannot help children to study but make them fall behind. So these parents lock computers in the boxes.

In some other countries, even some scientists hate computers. They say computers let millions of people lost their jobs or bring them a lot of trouble.

Will computers really bring trouble to people or can they bring people happiness? In fact, people can decide it by themselves.

设P为椭圆$\frac{x^2}{4}+\frac{y^2}{3}=1$上的一点，$F_1$、$F_2$为该椭圆的两个焦点，若$\angle F_{1}P{F}_2={60}^{°}$,则$△F_{1}P{F}_2$的面积等于（   ）

8月3日，第三届全域旅游推进会在西安举办，国家旅游局发布了《2017全域旅游发展报告》，同时举行了全域旅游示范省（区）创建单位颁牌仪式，将图中5个省新增为全域旅游示范省创建单位。截止目前，全国省级全域旅游示范区创建单位增至7个。