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Last holiday in winter, I went to Hainan with my parents. The beach was so nice.I ate lots of sea food there. I took some beautiful pictures of the sea. I bought many postcards for my friends. It wasn’t cold in winter. We went swimming every day. My father bought a white T-shirt and my mother bought a purple dress.
（ ）1. I went to Hainan with my parents last summer.
（ ）2. I took some beautiful pictures of the sea.
（ ）3. I bought many postcards for my families.
（ ）4. We went swimming in winter there. It’s wasn’t cold.
（ ）5. My mother bought a white T-shirt there.
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
