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Sarah is a good girl. She is friendly. She has many friends.
It’s April 25th today. It’s Sarah’s birthday. She is twelve years old. Her parents are going to have a birthday party for her in their house. Her friends want to come to her birthday party. But they can’t find the way to her house. They ask Robin for help. Robin’s grandpa gave him a new feature. He has BDS now. They follow Robin to go straight and tum left at the bookstore. They pass by the library and tum right. Then they see Sarah. It’s not far. Robin helps them find Sarah’s bouse. The BDS works well.
1．April 25th is Sarah’s twelfth birthday.2．Sarah is going to have a birthday party in her house.
3．Robin’s grandpa gave Robin BDS.
4．They pass by the library and tum left.
5．Robin can’t help them find the way to Sarah’s house.
同类型试题
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
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
