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Yang Ling: Hello, Helen
Helen: Look, this is my new schoolbag.
Yang Ling: Oh, it beautiful!
Helen: Thank you. Oh, where's my ruler? I can't find it.
Yang Ling: Don’t worry(别担心)! Is it in your pencil case?
Helen: Look! It isn't here.
Yang Ling: Is it in your desk?
Helen: Oh, yes. It's in my desk.
Yang Ling: Let's go home together.
1．Helen's schoolbag is new and nice.
2．Helen can't find her book.
3．Helen's ruler is not her pencil case.
4．Yang Ling and Helen are at home(在家).
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
