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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
