问题 选择题

下面是一些光学知识的应用实例;其中应用光的直线传播的实例是(  )

A.渔民用渔叉叉前方水中的鱼时,将渔叉对着稍低于所看到的鱼的位置叉去

B.在潜水艇中,用潜望镜观察水面上的景物

C.木工用一只眼睛沿一块木板楞的长度方向看过去,检查楞是否直

D.照相机的制作原理

答案

A、我们能看到水中的鱼,是由于鱼反射光线从水中射入到空气中的人眼里的缘故,故光线在水面处会发生折射,故渔民用渔叉叉前方水中的鱼时,将渔叉对着稍低于所看到的鱼的位置叉去,这是由于光的折射造成的,故该选项不符合题意;

B、由于潜望镜是利用平面镜成像的原理制成的,故在潜水艇中,用潜望镜观察水面上的景物的过程是利用光的反射原理,故该选项不符合题意;

C、木工用一只眼睛沿一块木板楞的长度方向看过去,检查楞是否直,这是利用光的直线传播的原理来工作的,故该选项正确;

D、照相机原理是利用凸透镜的成像规律制作而成的,故是利用光的折射的原理,故该选项不符合题意.

故选C.

阅读理解

Trying to leave work at the office is proving to be a challenge for many British workers,with research showing that heavy workloads,conflicts and bosses all make an appearance in dreams.

Work-related issues are the number one topic featuring in dreams,with colleagues invading shut.eye time more than celebrities.More than 20 per cent surveyed admitted that they regularly dream about their boss.One in three dreams about work when they are stressed in their job and a quarter stated that they dream about a colleague if there was a conflict with them earlier that day.

Of the 2,000 people surveyed,20 per cent dreamed more if they were under pressure or stressed.The research found that the average person dreams most nights,with only 12 per cent saying they never dream.However, dreams often leave people confused,with 52 per cent saying they do not make sense and 60 per cent wishing they could know what they mean.

Commenting on the survey carried out by One Poll for Premier Inn hotels,dreams expert Davina MacKail said:“Whether we are asleep or awake.a problem with a colleague or stress at work can really affect us.More than half of the nation stated that their dreams don’t make sense so I have worked with Premier Inn to make a Dream Dictionary to help dreamers to understand why they dream what they do and what those dreams mean.”

A spokesman for Premier Inn said:“It is really important to try to unwind after a hard day at work but that is easier said than done if something is playing on your mind.”

小题1:What Can we infer about the British workers?

A.Most of their dreams are work-related.

B.Some of them dream about work every night.

C.They dream of their colleagues more than their boss.

D.Their dreams involve work more than anything else.小题2:The survey shows that most people   

A.dream more under pressure

B.never dream at all

C.don’t understand their dreams

D.interpret their dreams well小题3:Davina MacKail expects people to use his Dream Dictionary when they   

A.have had a dream

B.want to prevent dreams

C.feel stressed and need relaxation

D.do research about dreams小题4:According to the spokesman for Premier Inn,it’s hard to relax if we    

A.dream about work while asleep

B.keep thinking hard

C.have sounds ringing in the mind

D.sleep in a noisy environment

填空题