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Today is Saturday. It's a sunny day. Lisa and Tina are having a picnic in the park. Look, the sun is shining. The flowers look so beautiful. Lisa and Tina are looking at some ducks on the lake. They are swimming. The ducks are very hungry. They are noisy too. Lisa gives some food to them. These ducks eat happily. Lisa and Tina are having a good time.
1．Lisa and Tina are having a picnic on Friday.2．It is a fine day today.
3．The ducks are swimming on the lake.
4．The ducks are hungry and quiet.
5．Lisa and Tina are very happy today.
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
