1. (2021九上·哈尔滨开学考) 根据短文内容选择最佳答案。

Recently, as more students use computers for a long time to have online lessons, more of them are feeling eyestrain(眼睛疲劳) Just a few hours in front of a computer screen can make a person's eyes feel tired and painful. A lot of eye doctors have studied this problem and have found ways to solve it. Following their advice will help keep computer users more comfortable.

★Lighting

The light in a room shouldn't be brighter than the computer screen itself. Maybe in many students' rooms, however, the lights are far brighter than they should be. Students can block some of this light by wearing baseball caps to protect their eyes.

★The Screen

A special computer screen which has less bright light should be used, because bright light is especially bad for the eyes. Another problem is to avoid the wrong kind of contrast (对比). Many people think that having light letters on a dark background can cause less eyestrain, but they are wrong. In fact, it is best to have dark letters on a light background.

★Angle (角度) of looking at the computer screen

Students should sit in front of the computers so that they are looking down at the computer screens. The top of the monitor(显示器) should not be so high as the top of a student 's head.

Breaks and Blinks (眨眼)

If students spend a long time in front of a computer screen, it can cause eyestrain. Students should take a break by looking away from the screen every fifteen or twenty minutes. During that time they should either close their eyes or look at things far away. Students should remember to open and close the eyes often while in front of the screen.

1. （1） The underlined word "block" in the passage means "___________" in Chinese.

   A . 阻挡 B . 接收 C . 反射
3. （2） According to the passage, _________ can cause less eyestrain.

   A . light letters on a light background B . light letters on a dark background C . dark letters on a light background
5. （3） The top of the monitor should ________ the top of a student's head.

   A . be higher than B . be lower than C . be as high as
7. （4） According to the passage, which of the following is TRUE?

   A . The light in a room should be brighter than the computer screen itself. B . Bright light isn't good for students' eyes. C . While using the computers, the students should close their eyes and look at things far away.
9. （5） The passage is mainly about ________.

   A . how to use computers correctly B . how to protect students' eyes while using computers C . students should take a break every 15 or 20 minutes while using computers