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Today is Sunday. The sun is bright. The students of Grade Five are having a field trip. Look！ The butterflies are flying. The birds are singing. Jack and Kate are drawing pictures near the river. Amy is reading a book. Peter, John and Tom are picking up leaves in the woods. Chen Jie is flying kites. What about Sarah? Oh, she is writing a report. What a good time they are having!
1．The students are in Grade Four. （2．They are having a party. （
3．There are some butterflies there. （
4．Jack and Tom are drawing pictures. （
5．They are very happy. （
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
