In spring, it is often warm. The trees and grass turn green in spring. Sometimes it’s windy, so we can fly a kite outside. In summer, it’s hot. It usually rains. The days become long and the nights become short. We can go swimming in summer. In autumn, it is cool. The leaves fall down from the trees. People like to have a picnic with the family. In winter, it’s cold. Sometimes it snows. We can ski and skate. They are very interesting. We can also play with the snow.
1.The trees turn2.In summer, it usually
3.The
4.People usually have a picnic in
5.We can

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

