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Who do you think are the most important people in your life, your parents, your sisters or brothers, or your friends?
It’s very important for teenagers to have one friend or a group of friends. It may be because we can discuss some private (私人的) things with friends.
| A．Of course we don’t tell these things to our family members. |
| B．I think family members are the most important people in our life. |
| C．In large families, brothers and sisters often argue (吵架) with each other. |
| D．In fact, they do this just because they really care about us too much. |
| E．I think your answers must be “friends”. |
| F．I think the best way is to find a right time to talk with parents about our feelings (想法). |
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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
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
