为了防止考生作弊，现在不少考场安装了电子屏蔽设施，其作用是屏_爱下问搜题

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问题填空题

为了防止考生作弊，现在不少考场安装了电子屏蔽设施，其作用是屏蔽______．

答案

电磁波是由变化的电场和变化的磁场组成的，变化的电场产生磁场，变化的磁场产生电场，二者缺一不可，否则就无法传播．当电磁波遇到金属物体，金属是导体，带有大量电子，会破坏电场的形成，也就无法形成磁场，从而截断了电磁波的继续传播．

故答案：电磁波．

完形填空

Music and Behavior
Where did you go yesterday? Did you hear 41 at any of those places? Today most stores and restaurants play music. You might 42 hear music in an office or on a farm.
Scientists believe that music changes the 43 people behave. According to some scientists, the sound of western classical music makes people 44 richer. When a restaurant plays classical music, people spend 45 money on food and drinks. When the restaurant plays 46 music, people spend less money. With 47  music, people spend even less.
Scientists also 48 that loud , fast music makes people eat faster. In fact, people 49 their food faster when the music gets faster. Some restaurants play fast music during their   50 hours. This gets people to eat faster and leave more quickly. In this way, restaurants 51  make more money.
Some scientists think that music makes you think and learn better. They say 52 music helps students to be more active. It is true that people earn better when they are 53 . And listening to music can help you relax.
The 54 time you hear music somewhere, be 55 . It might change the way you do things.

单项选择题

下列不属于手机操作系统的是______。

A．IOS

B．Android

C．Windows 8

D．Windows Phone