It all began with a perfect gift. A couple of months before I started high school, my parents gave me the greatest gift any teenage boy could ask for: a smartphone. I lived on that phone all summer with my face buried in its screen. I held multi-day marathon messages with every friend to keep in contact with them. I ignored my family and my surroundings. Being connected was more important than being present.
So, I felt extremely displeased when I learned about my father’s travel arrangements for our family vacation that year. “This year,” my dad said, “we’ll be doing something special. We’re going camping.”
His excitement was met with a disappointed sigh (叹气). But I wasn’t too annoyed. It wasn’t my dream vacation, but it was still a vacation. I remained uninfluenced throughout the packing, planning and, of course, the instructions that went in one ear and out the other. I fixed my mind on the screen in my hands so much that the first time I raised my eyes was when we drove across a bridge on the way to our campsite.
I stared out the window and saw a fast-moving river. The air blowing into the car was hot and smelled of trees. But none of that mattered to me. The reason why I had looked up was for something far more serious. More shocking. My phone no longer had service.
Then my dad revealed that he had chosen a destination where there was no phone signal, and my phone — my lifeline — would be useless until we returned home. I would be trapped in the forest for four days with no way to contact the outside world.
On the first day, I shouted. I bargained. I begged. However, nothing would add signal bars (信号条) to my phone service. I went to bed angry that night, thinking I would be bored to death the next day.
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Without my phone, however, I found a totally different world the next morning.
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The four days passed in a flash, full of fun activities.
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同类型试题

y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2


y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

