学进去-教育应平等而普惠
试题
类型:阅读选择
难度系数:0.65
所属科目:小学英语

Everyone knows that it is important to take care of (关心) our eyes. But how can you take care of your eyes? The answer is simple. Have your eye doctor check your eyes regularly (有规律地)—at least once a year? Doctor will use special equipment (设备) to examine (检查) changes and problems in your eyes. If you think something is wrong, don’t wait. The sooner you take care of the problems the better.

1.How can you take care of your eyes? (       )
A.Don’t use them.B.Read in the sun.
C.Ask the doctor to check them regularly.D.Ask your parents to look at them.
2.How often should you check your eyes? (       )
A.At least once a year.B.Every summer.
C.At least three times in life.D.On the weekends.
3.Which is not true? (       )
A.Everyone knows that protecting eyes is very important.
B.We can never know if there is anything wrong with our eyes.
C.Special equipment can help to find problems in your eyes.
D.If there is something wrong with your eyes, you had better see the doctor right now.
4.Which is a good habit for your eyes? (       )
A.Read in bed.B.Watch TV for long time.
C.Study for long time.D.Often do eye exercises.
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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

用户名称
2019-09-19

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

用户名称
2019-09-19
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