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How much time do you spend looking at your smartphone, tablet or computer every day? These electronic devices help us in many ways, but they may also cause health problems.

Too much screen time can cause eyestrain which leaves your eyes feeling dry and sore and could also affect your eyesight. To help your eyes stay healthy, follow the "20-20-20" rule: every 20 minutes, look at something 20 feet away for 20 seconds.

Your eyes aren't the only parts of your body that could become worse from using electronic devices. People who write a lot of text messages can develop an injury called texting thumb". The repeated movement of typing with thumbs can cause thumb and wrist pain and lead to the loss of grip strength (握力受损).To avoid this, do this exercise: put a rubber band around the tips of your five fingers and open your hand to stretch the rubber band. Repeat this a few times.

Scientific research suggests that electronic devices can also hurt your mind. One of the biggest problems is that using these devices can affect your sleep patterns. Doctors say the screen light stop you from feeling sleepy. So they advise people not to use electronic devices for at least one hour before trying to sleep.

Another serious danger is Internet addiction (瘾). Many people turn to the Internet to ease feelings of stress, sadness, and loneliness. Over time, they might start to depend on the Internet and feel worried if they're not connected. To stop yourself from falling into this kind of trap, limit the amount of time you spend on line.

To use your smartphone or computer safely, just make sure you follow these health tips. Also, remember that there is more to life than looking at an electronic screen.

1.The first 20 of the "20-20-20"rule in the passage suggests ________.

A.how long the break lasts

B.how often you have the break

C.how far you look at objects from you

D.how long you need to take a break

2.Which picture best shows the rubber and exercise according to the passage?

A. B. C. D.

3.The underlined word "they" in Paragraph 5 refers to ________.

A.computer games or Internet B.feelings of stress, sadness and loneliness

C.several serious mind problems D.people who have Internet addiction

4.What's the passage mainly about?

A.Electronic devices can hurt both your body and mind.

B.Looking at screen for too long can cause sore eyes.

C.Typing a lot can develop "texting thumb".

D.The more you depend on the Internet, the less worried you might be.

九年级英语阅读单选中等难度题

少年,再来一题如何?
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