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Grandpa Li was very old. He lived in a small village. It is far away from the town. So he knew less about the world. One day, Grandpa Li went to the town to buy something. In a park, he saw many old people reading, and they all wore glasses. So after lunch he went to a shop to buy a pair of glasses. The salesgirl let him try on a lot of glasses, but Grandpa Li always said, “I still can't read after wearing them.” The salesgirl was very surprised and asked, “Excuse me, can you read?” “No, of course I can't!” Grandpa Li said. “But I think a pair of good glasses can help me read.”
1．Where did Grandpa Li live?2．Did Grandpa Li know much about the world?
3．What did the old people in the park wear?
4．Where did Grandpa Li go after lunch?
5．Can Grandpa Li read?
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
