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Eyes are very important to us. Many people say that eyes are the windows to our hearts. Without eyes, we can't see the beautiful world around us. But not many people have good habits(习惯) of using their eyes, and have become short-sighted. Do you often watch TV or play computer games for a long time? Do you often read or write in the sun? Do you watch TV in bed? If your answers are "No", it means that you know how to protect your eyes. June 6th is the National Eye Care Day(全国爱眼日). This year the theme(主题) is " Protecting our eyes." I wish everybody a good eyesight.
(1). Eyes are very important to everyone.
(2). Without eyes, we can't see the things around us.
(3). Everyone has some good habits to protect eyes.
(4). Watching TV in bed is a bad habit.
(5). The National Eye Care Day is on June 6th every year.
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
