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
阅读判断,正确的用“T”表示,错误的用“F”表示。

Do you know Earth Hour? It is usually on the last Saturday of March. Many people turn off the lights. Lucy usually does her homework in the evening , but now she is looking at stars. Lily usually watches TV at night, but now she is listening to music. Their father always reads newspapers before bedtime, but now he is talking with his wife. They are proud to do something to save the Earth.

1.Many people turn off their lights at Earth Hour. (     )
2.Both Lucy and Lily usually do their homework in the evening. (     )
3.Lucy is looking at stars now. (     )
4.Earth Hour is usually on the last Saturday of May. (     )
5.Lucy and Lily’s mother is talking with their father. (     )
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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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