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It's a sunny day. Daming goes to a park with his friend, Tom. There are many people in it. Two little boys are singing under the tree. An old man is running around the lake. Some girls are flying kites. Two men are playing chess. Daming and Tom like boating. Look! They are very happy in the boat.
1．Two little boys are dancing under the tree. （2．An old man is running around the lake. （
3．Some girls are flying kites. （
4．Two men are playing chess. （
5．Daming and Tom are in the boat.（
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
