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在这个单元里，我们继续学习了如何描述正在进行的动作或保持的状态，假如现在是晚上七点钟，接下来就请你依照例文来写一写你的家人都在做些什么。
范文：
On the farm
It's sunny today. We are on a big farm. There are some animals and green trees on the farm. Look! Some horses are running on the grass. Lots of fish are swimming in the river. Three cows are eating and four ducks are singing. They are so lovely. Little pigs are playing with each other. They are good friends.
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
