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What do you know about the sea? Some people know about it, but others don’t. The sea looks beautiful on a fine sunny day, the sea is very big. In the world, there is more sea than land. Do you know Hainan Island? It’s really very nice. We can see beaches, trees and the sea. We can swim and visit a lot of beautiful places.
1．The sea looks beautiful on a fine sunny day. （2．In the world, there is less sea than land. （
3．The sea is big and nice. （
4．We can make a snowman and visit a lot of beautiful places. （
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
