搜索
It is Saturday morning. Jill and Helen are walking in the square. Suddenly, they see something on the flowers. Oh, it is a beautiful butterfly. Jill looks around. There is no one near them. She quickly walks to the flowers and wants to pick it up. But Helen says, “You shouldn’t walk on the grass. And we shouldn’t catch the butterfly.” Then a park keeper comes up to them. The park keeper points to a sign on the grass. He says to them, “Can’t you see the sign over there, girls? It says ‘Please keep off (不接近) the grass’.” Jill’s and Helen’s faces are red now.
1．It’s Sunday morning.2．Jill and Helen are in the park.
3．There’s a butterfly on the flowers.
4．Jill wants to catch the bird.
5．We shouldn’t walk on 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
