On Sunday, Tom usually gets up at 9 o’clock. Today, Tom got up at six, because he would go to a picnic with his parents. But it was raining, so they couldn’t go to the picnic in the park. Tom went to the kitchen and said to his mum, “We can’t have a picnic.” Mum said, “Wait a minute.” Then, Mum took out the food, a fan and a recorder. “It’s just like in the park, a cool wind and the bird’s singing.” Mum said.
( )(1) Tom got up at six today because he would have a picnic.
( )(2) It was raining and Tom couldn’t go to the picnic.
( )(3) Tom’s family had a picnic at home.
( )(4) There was birds’ singing at Tom’s home.
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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)