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Hello, I’m Yuanyuan. Yesterday was Saturday. I didn’t go to school. I was at home. I helped mum and I washed my T-shirt. Now the T-shirt is clean. My brother Xiaoyong was at home too. But he didn’t helped mum. He played on the computer all day. It’s bad for his eyes.
1．Yuanyuan didn’t go to school on Saturday. （_____）2．Yuanyuan helped her mother. （_____）
3．Xiaoyong helped his mother too. （_____）
4．The T-shirt is clean. （_____）
5．Xiaoyong played football all day. （_____）
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
