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学进去-教育应平等而普惠
试题
类型:任务型阅读
难度系数:0.65
所属科目:小学英语

   Spring is a nice season. The sun shines warmly. The trees and grass by the lake turn green. Ducks swim on the lake. People go boating on the lake.

In summer, the weather is hot and sunny. At noon, the lake is quiet. Early in the morning and late in the afternoon, people come and swim in the lake.
Now it is autumn. The leaves turn yellow and the weather is cool. On windy days, some children fly kites by the lake.
In winter, the lake is frozen. The weather is very cold, but people can also have fun. They play in the snow. They skate on the lake. The lake becomes a playground in winter.
1.There are some trees by the lake. (_____
2.In spring, you can see ducks on the lake. (_____
3.In summer, many people swim in the lake at noon. (_____
4.In autumn, children fly kites by the lake. (_____
5.In winter, the lake becomes a quiet place. (_____
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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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