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There are no classrooms in Animal School, but there is a forest and a river. The forest is not small. It's big and green. The river is small, but it's long. Look, there are some animals there. Listen, what are they talking?
Mr Cow: Welcome to Animal School What's the matter?Little Duck: I'm sad. I can't run, and I can't jump. I'm a bad duck.
Mr Cow: I don't think so. Please don't be sad.
Animals: Come on, everyone! Let's swim together!
Mr Cow: Have a try, Little Duck! You can swim very well.
Animals: Wow! Look at the Little Duck! He is so fast!
Little Duck: I'm the first! I'm so happy!
1．We can see some classrooms. （
2．The forest is big. （
3．The duck can run and jump. （
4．The duck can swim very fast. （
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
