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Our eyes are very important to us. They are like cameras (照相机). We can see beautiful things and colours around us with our eyes. But if we don’t take care of them, they may hurt. How do we protect (保护) our eyes?
On sunny days, we had better wear our sunglasses. When we read, we should not stay too close to our books and the light should not be too bright (明亮的) or too dark (黑暗的). We must not read in bed. It is bad for our eyes. We can’t read books in a bus or play games on computer too long.
We should do everything to protect our eyes.
1．We can see colours with our eyes.2．Reading in bed is good for our eyes.
3．Wearing sunglasses on sunny days is good for our eyes.
4．We should take good care of eyes.
5．We should stay too close to books.
6．We should do nothing to protect our eyes.
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
