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John：Look! This is my picture．
Mary：It's beautiful! Is it a nature park?
John：Yes, it is. There is a lake in the park. There are many rivers and bridges.
Mary：Is there a forest in the park?
John：No. there isn't.
Mary：Are there any flowers?
John：Yes, there are. You can see many flowers on the grass.
Mary：Oh, yes. Then we can't run on the grass.
It's a nature 1 ．There is a 2 in it．There are many 3 and 4 ． But there isn't any 5 ．You can see many flowers 6 7___ 8 ．So we ____9____ run 10 the grass．
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
