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（_____） 1. Lucy's mother is ______.
A. cooking breakfast B. washing clothes C. sweeping the floor
（_____） 2. Su Hai is ______.
A. doing her homework B. playing games C. drawing pictures
（_____） 3. Yang Ling is in the ______.
A. bedroom B. kitchen C. living room
（_____） 4. They are ______.
A. playing table tennis B. playing football C. playing basketball
（_____） 5. Wang Bing is in the ______.
A. reading room B. bookshop C. classroom
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
