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Happiness is for everyone. In fact, happiness is always around you if you care about it. When you are in trouble at school, 1. 你的同班同学将会帮你; when you study hard at your lessons, 2. your parents are always looking after you; when you get success（成功）, your friends will say congratulations to you; when you do something wrong, people around you will help you correct it; and when you do something good to others, 3. you will feel happy, too. All these things are happiness. If you pay attention to them, you can see happiness is always around you. 4. Happiness is not the same as money. When you are poor, you can say you are very happy, because people can’t buy happiness with money. When you meet problems, you can also say loudly you are very happy, because you have many friends to help you. So you can’t always say you are poor and you have bad luck.5. 如果你赞同我, you can be a happy and lucky person.
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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
