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| A. 他们正在吹唢呐。 B. 他的朋友们找不到他。 C. 玲玲正在举办一场生日派对。 D. 他正在和一个朋友谈话，但是电话响了。 E. 他们正在吃晚饭，但是门铃响了。 |
1．Lingling is having a birthday party. （
2．They're playing the suona. （
3．He's talking to a friend, but the phone rings. （
4．His friends can't find him. （
5．They're eating dinner, but the bell rings. （
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
