A.
![](http://static.xuejinqu.com/qimg/a49/a49ff45626239bdfaee37ba2adf8e7e6.png)
![](http://static.xuejinqu.com/qimg/4db/4db1ed4a6020d2c4fac871bbd47f4aed.png)
![](http://static.xuejinqu.com/qimg/285/285e128a592e1295e142b54eff42354b.png)
![](http://static.xuejinqu.com/qimg/9a7/9a72c1968084805295d4b7cb29e2994c.png)
1.My sister gets up at six o’clock in the morning. (_____)
2.I usually get up at 6:30 in the morning. (_____)
3.My brother goes to school at 7:00. (_____)
4.We have classes at 8:00. (_____)
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同类型试题
![](http://static.xuejinqu.com/images/medal.png)
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
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)
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
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)