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It was very cold in the morning. I was playing with some of my classmates in the park. We were running about on the ice, laughing and joking. Suddenly(突然), something dangerous happened. The ice broke(破) and one of my classmates fell(掉) into the cold water. We all shouted, “Help! Help!” Just at this time, a boy of the same age ran over. With the help of him, we pulled(拉) our classmate out of the water. In the face to danger, the boy was very brave. We all admire(敬佩) him very much. I will never forget(忘记) him. What a lovely world we live in!
1．It was hot in the morning.2．I was playing with my classmates in a zoo.
3．One of my classmates likes swimming in the cold water.
4．A young man ran over and pulled our classmate out of the water.
5．Here the word “Help” means “救命”.
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
