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| What | Smartphones (智能手机） |
| Example 1 | A mother is looking at her smartphone while her little son is in 1． in the river. |
| Example 2 | At a family party, the2．as well as their parents have their eyes fixed(注视)on smartphone screens, leaving their grandparents alone. |
| Bad results of overusing(过 度使用）them | 3．no attention to others' safety. |
| Do harm to the relationships between you and 4． fiends and family. | |
| The right way of using them | Use them5．and focus more on the people around. |
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
