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Sam was not happy yesterday. He was ill. He had a bad cold. His mother asked him to stay in bed. In the afternoon, his good friends Tom and Mike came to see him. They bought a lot of fruit and flowers for him.
Today Sam is fine. It’s Christmas. He is going to buy colourful balls and lights. He’s going to buy some Christmas cards, too.
1．Yesterday Sam had a headache.2．In the morning, Tom and Mike came to see Sam.
3．Tom and Mike bought a lot of candies and fruit for Sam.
4．Today is Christmas.
5．Sam is going to buy colourful balls, lights and Christmas cards.
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
