学进去-教育应平等而普惠
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类型:短文改错
难度系数:0.85
所属科目:高中英语
短文改错

Last week I visited a small village to see the brown bears, what come to the villages at night to look at food. I waited with some tourist. As it grew dark, we see the huge black shapes of the bears. Those clever bears knew where to go for its dinner: the rubbish where there was lots of food people have thrown away. Although it’s wonderful to see the bears in the village, but it can only mean one thing: their habitat is disappearing. They would prefer to stay hiding in the mountain forests, but the trees have cut down for firewood. However, they cannot find enough food any more.

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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

用户名称
2019-09-19

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

用户名称
2019-09-19
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