问题 选择题

如图是张敏同学拍摄的南湖大酒店风景相片,下面说法正确的是(   )

A.要想使大楼的像更大些,张敏应向大楼靠近些,再拍摄

B.大楼在湖中的倒影是由于光的直线传播形成的

C.大楼在湖中的倒影是由于光的折射形成的

D.拍摄时底片上的像是倒立放大的虚像

答案

答案:A

题目分析:A、张敏同学拍摄的西湖大酒店风景相片,要使大楼的像更大些,必须将照相机靠近大楼,照相机镜头向外伸像就会变大,本选项的说法是正确的;

B、大楼在湖中的倒影等同于平面镜成像,是光的反射形成的,说由于光的直线传播形成的是错误的;

C、大楼的倒影是光的折射形成的是错误的;

D、照相机所成的像是倒立缩小的实像,所以说拍摄时底片上的像是倒立放大的虚像是错误的.

故选A.

点评:(1)照相机应用的是物距大于二倍焦距,凸透镜成倒立缩小的实像,当物距减小时,像距增大,像也随之变大.(2)光在传播过程中,发生的传播规律有沿直线传播、发生反射、发生折射.

阅读理解

There were times it was only schoolchildren who felt sick before they got their grades. But now teachers in Germany are scared, too, as they are being graded by their students.

Many teachers are opposed to it. They don’t mind being evaluated(评价). But they are upset because the results are then being posted on the Internet and accessible to millions of Internet users. On the website www.spickmich.deduring the past four months students have posted evaluation of 100,000 teachers.

The teachers are graded on categories such as “motivated”, “good instruction”, “easy examinations”, or even “sexy”. Many teachers think that their privacy has been violated.

The creators of the website say that the students are only being offered the chance to provide teachers with some feedback about their classroom instruction. Bernd Dicks, who founded the website with three friends, says that the students are largely quite satisfied with their teachers. On a grading scale of one to six, the teachers’ average grade is 2.7 and it has been improving lately. He often says the impression is that students are bullying(威吓) their teachers. But there is also bullying of the students by teachers.

“Teachers must also learn to live with criticism,” he added. But still, the website is not totally immune from manipulation(操纵), as one teacher near the northern city of Hanover recently proved. He registered himself on the website as a student and then rated his own teaching colleagues highly. Within a few days, seven of his colleagues were listed in the top 10 ranking of Germany’s best teachers.

小题1:Many teachers are opposed to the website because_____.

A.their privacy has been violated

B.they are afraid of being assessed

C.their evaluations are unfair

D.the results are not satisfying小题2:We can infer that the founder of the website intended to _____.

A.get the students to know their teachers better

B.conduct a survey on teachers’ performance

C.help the teachers to improve their teaching

D.change the teachers’ ways of giving instructions小题3:From what the teacher in Hanover did, we can infer _____.

A.he intended to help his colleague

B.there was some disadvantage of the website

C.his colleagues were more popular than him

D.he wanted to know how he was evaluated

单项选择题