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It was a fine day today. Wu Yifan had a race with his father and Max. There were many people there. At first his father ran fast, but Wu Yifan could not. There was nothing he could do. He was so worried. “I could run fast,” he thought. At last, he won the race.
1．It was a good day. （2．Wu Yifan had a race with his mother and Max. （
3．Wu Yifan ran fast at first. （
4．There weren’t many people there. （
5．Wu Yifan won the race at last. （
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
