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Snail wanted to travel all around the world. "But you are too small." said Mum and Dad. Snail didn't agree. He went to France by ship. Snail saw the Eiffel Tower (埃菲尔铁塔). He climbed to top of it. An eagle (老鹰) flew by. "Can І come with you?" he asked the eagle. The eagle took him to the UK. Snail saw Big Ben. A hot-air balloon flew by. The hot-air balloon took him to the USA. Then he went to China and climbed to the Great Wall. Snail was tired. He came back home by bus. His parents waited for him. They said: "What an adventurer (冒险家) you are!"
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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
