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It is a snowy day. Snow is white and beautiful! Mr. snowman, Mrs. snowman, and Boy snowman are in the forest. They play with snowballs. Then Mr. snowman teaches Boy snowman to skate on the ice. Boy snowman says, “I think I can stand up.” “See? I did it!” Mrs. Snowman says, “Goodboy! Winter is fun. We can play in the snow and we can skate. Do you love winter?” “Sure!” says Boy Snowman.
1．It is winter now.2．The Snowman family are in the forest.
3．They swim on the ice.
4．Boy Snowman can’t stand up on the ice.
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
