When I was 13, I climbed my first mountain — a fairly gentle 3, 900-foot peak near where I live in Surrey, British Columbia. I loved the challenge of conquering something bigger than myself. Soon I’d climbed nearly 100 peaks.
I often go climbing with my friend Mel Olsen. Two years ago, on December 30, when I was 16, she and I drove to Oregon to conquer 11, 240-foot Mount Hood.
It's safer to start winter climbs at night when there's less risk of the sun melting the snowpack. That day, we started at 3 a. m. The temperature was about 14 degrees, and we wore clothes we could easily remove. Along the way, we met two other climbers, and the four of us continued on together.
After about five hours, we reached Devil's Kitchen, a plateau at about 10, 000 feet, just before the final push to the top. By this point, the wind conditions were horrible. My exposed skin felt as though it were burning. The other climbers decided to turn back, but Mel and I went ahead. We had ice axes (斧), helmets, and crampons (钉鞋). We were prepared for the climb.
The trail we followed grew narrower and steeper. At around 9 a. m., we reached a patch of ice called an ice step. It was about three or four feet tall and sloped at a 75-degree angle. I volunteered to go first. I placed my left foot on the ice step.
I gained a sense of the ice when I stuck my ax and crampons into it, and it felt good. Confident that I was safe, I put my full weight on it. Suddenly, I heard a crack, and a whole block of ice broke off the step, right under my foot.
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In an instant, I fell backward.
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As Mel made her way down, I yelled for help.
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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

