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Helen Keller was born in America in 1880. When she was very young, she got very sick. After that, she could not hear, speak or see. Helen worked very hard. She learned how to read, write and talk. When she was 20, she went to university. She is famous for writing many books and helping the deaf and blind.
1．Helen Keller was born in America in 1880. （_____）2．When she was very young, she got very sick. （_____）
3．Helen didn’t work very hard. （_____）
4．When she was 20, she went to university. （_____）
5．She is famous for writing many books and helping the deaf and blind. （_____）
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
