问题 多选题

如图所示的图象能正确反映下面哪两个量的变化规律(  )

A.初速度为零的匀加速直线运动的速度与时间,y表示速度,x表示时间

B.闭合电路的路端电压与外电阻,y表示路端电压,x表示外电阻

C.质量一定的物体的加速度与所受的合外力,y表示加速度,x表示合外力

D.光电效应现象中,光电子的最大初动能与入射光子的频率,y表示光电子的最大初动能,x表示入射光子的频率

答案

A、由图象可知:y正比于x,而初速度为零的匀加速直线运动速度与时间的关系为:v=at,A正确;

B、闭合电路的路端电压与外电阻U=E-I(R+r),不能用过原点的直线表示两者的关系B错误;

C、物体的加速度与合外力的关系为:a=

F
m
,所以可以用此图象表示,C正确;

D、光电子的最大初动能与入射光子的频率Ek=hv-W,不能用过原点的直线表示两者的关系,D错误;

故选AC

阅读理解

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Active listening is an essential skill in learning. It is when you listen carefully to make sure you understand and learn the information that is being conveyed.     小题1:  Here are some things which can help you to listen actively.

   小题2:   . Don’t just write everything down. Listen carefully and make sure you understand what the purpose of this lecture is. As you take down notes, keep the main point in mind and make sure you understand how these notes are related.

◆Listen for an organizational structure. Listen carefully to figure out how the ideas are organized and they will make more sense.

◆Pay attention to organizational cues (暗示).    小题3:   Pay close attention to the introduction, as it will probably show how you should organize your notes. If the lecture begins with, “Today I’m going to talk about three ethnic conflicts (种族冲突) in the Middle East,” then you have a good idea of what’s going to follow. Listen for “signpost” words to show a transition (过渡) from one point to the next, such as “next” and “finally” and numerical signposts like “first” or “third”.

◆Listen with your eyes.   小题4:   Watch the teacher and be aware of how he or she uses hand gestures, eye contact and other body language to convey points.

◆Remove distractions. Put away the campus newspaper, your cell phone and anything else that might be more interesting than the lecturer.

Learning to concentrate and listen actively is an endurance(耐力) skill.   小题5:  

A.Speakers communicate information through nonverbal communication.

B.Unfortunately, many students don’t know how to listen actively when they attend classes.

C.If your teacher indicates that something is important, mark it.

D.Make yourself do it, and it will get easier over time.E. Listen carefully for words and phrases that reflect the organizational structure of the lecture.

F. Your teachers’ notes are probably organized into some kind of outline.

G. Listen for the main point and major sub-points.

单项选择题 案例分析题