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（1）在课桌下 u______ the d________
（2）唱一首英语歌 s______ an English s________
（3）扫地 s_______ the f__________
（4）放学后 a _______ s __________
（5）一罐头鸡肉 a tin o______ ch __________
（6）上一堂美术课 h_______ an Art l__________
（7）Are you free now? _______________________________________
（8）What is she doing? _______________________________________
（9）Let’s go for a camping trip. ________________________________
（10）How about this afternoon?________________________________
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
