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

We use our smartphones to carry out many tasks every day. Many of us become so reliant on them. We even need them when we do anything. But it is bad for our eyes and health to use smartphones too much.

A research(研究) shows that many smartphone users usually start to use their phones early in the morning. They check personal emails and WeChat. And before they get out of bed, they often check the weather, read the news, and send messages to one or two friends. After getting up, they often take photos of food, and even whatever(无论什么) they can see with their phones. They share their photos with their friends. The research also finds that users pick up their phones more than 1,500 times to do different tasks every week. And the smartphone users are on their phones for about three hours and sixteen minutes a day. That is to say, people use their phones for almost one full day each week.

Using phones takes much time and it’s also bad for our health. Many people stay up late to play on the phones at night. And mobile phones influence(影响) our sleep. Without using the phones, many people will feel bad. Many users also find they use their phones without realizing (意识到) they’re doing so.

1.The word “reliant” means “依赖的”. (      )
2.Many users usually start to use their phones early in the morning. (      )
3.People get up early because they use smartphones. (      )
4.People pick up their phones more than 1,500 times every day. (      )
5.Using smartphones influences people’s sleep. (      )
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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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