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Today is Mother's Day (母亲节). Dabing wants to buy something for his mother. What does he buy? He doesn't buy a card as usual (通常地). And he doesn't buy a rose because his father often buys it for his mother. Look! He buys an English book. He says it can help mother learn English.
1．Dabing wants to buy something on Mother's Day.2．Dabing buys a rose for his mother on Mother's Day.
3．He doesn't buy a card for his mother.
4．Dabing's father never buys a rose for his mother.
5．The book is for learning English.
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
