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Lucy is nine years old. She has big eyes and long hair. She’s a pupil. It’s Wednesday today. It’s hot and sunny. Now it’s 10:00 am. Lucy and her classmates (同班同学) are in their classroom. Lucy is helpful. She’s cleaning the blackboard. Sam is reading a storybook. Liu Xin and Kate are talking. Sun Nan and Li Ming are playing a game.
1．Lucy has big eyes and short hair.2．It’s Wednesday today.
3．Lucy and her classmates are in their classroom now.
4．Sam is cleaning the blackboard.
5．Liu Xin and Kate are talking.
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
