问题 填空题

站在水池边,看到云在池水中飘荡,还可以看到鱼在云中穿行,“水中云”是由于光的____ (选填“直线传播”、“反射”或“折射”)而成的_____(选填“实像”、“虚像”);“云中鱼”是由于光的______(选填“直线传播”、“反射” 或“折射”)而成的____(选填“实像”、“虚像”)。

答案

反射,虚像,折射,虚像

题目分析:光在自然界中存在三种光现象:光在同种均匀物质中沿直线传播,在日常生活中,激光准直、小孔成像、日月食、影子的形成等都表明光在同一种均匀介质中是沿直线传播的;当光照射到物体界面上时,有一部分光被反射回来发生反射现象,例如:平面镜(穿衣镜、潜望镜、水面的倒影)、凸面镜(汽车后视镜)、凹面镜都属光的反射原理;当光从一种介质斜射入另一种介质时,传播方向的会偏折,发生折射现象,如:看水里的鱼比实际位置浅、池底变浅、看到鱼变高、筷子向上弯、海市蜃楼等都属光的折射原理;站在水池边,看到云在池水中飘荡,还可以看到鱼在云中穿行,“水中云”是由于光的反射而成的_虚像;“云中鱼”是由于光的折射而成的虚像。

点评:解决本题的关键是熟知光的直线传播、光的反射以及光的折射现象:知道光在自然界中存在三种光现象:光在同种均匀物质中沿直线传播,在日常生活中,激光准直、小孔成像、日月食、影子的形成等都表明光在同一种均匀介质中是沿直线传播的;当光照射到物体界面上时,有一部分光被反射回来发生反射现象,例如:平面镜(穿衣镜、潜望镜、水面的倒影)、凸面镜(汽车后视镜)、凹面镜都属光的反射原理;当光从一种介质斜射入另一种介质时,传播方向的会偏折,发生折射现象,如:看水里的鱼比实际位置浅、池底变浅、看到鱼变高、筷子向上弯、海市蜃楼等都属光的折射原理。

完形填空
Mr.Lin is a farmer who lives in western China with his wife and two kids.Two months ago, he was told that he had cancer and he needed        at once.And he knew he would spend a lot of        on the operation.It was too much for Mr.Lin’s family.They had no jobs and both their children were at school.The situation seemed        .
After two weeks,        , Mr.Lin got a piece of good news.He was told about a health care project which provides medical treatment for         patients in western China.They need to pay only half the cost or even less.      the project, he was able to receive an operation just in time to stop the illness from getting        .Now he has returned to his family.
The goal of this health care project is to improve the situation for poor people in      China.So far, the project has helped more than 5,000 people to       medical aid.The Chinese government is also working together with other       and international organizations to do this.They hope to develop a new health care model for China.
小题1:
A.some medicineB.some helpC.an operationD.a doctor
小题2:
A.moneyB.timeC.workD.energy
小题3:
A.hopefulB.hopelessC.colorfulD.colorless
小题4:
A.insteadB.thoughC.butD.however
小题5:
A.youngB.oldC.poorD.rich
小题6:
A.Thanks toB.Thanks forC.According toD.Instead of
小题7:
A.badB.worseC.wellD.better
小题8:
A.easternB.southernC.westernD.northern
小题9:
A.offerB.makeC.giveD.receive
小题10:
A.townsB.provincesC.citiesD.countries
单项选择题