题干

小明和小华在平直公路上进行骑自行车比赛,他们的速度和时间的关系如图所示,下列叙述正确的是(  )

A:小明和小华在开赛后的4s内速度相同

B:小明和小华都是由静止开始加速,后来速度相同

C:开赛后4s内,小明和小华都在做加速直线运动,但按图示的速度,小华会输

D:小明和小华后来都停止加速,但小华停止加速在先

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答案(点此获取答案解析)

C

同类题2

左栏是五个人关于演讲的问题,右栏是七个关于演讲的建议。请将这五个人与对应的建议配对

____ I don’t think I can talk fluently because it’s difficult for me to remember all the words.
____ When I come face to face with the audience, where should my eyes fall upon? Do I have to look front, or look around from time to time?
____ When I am talking, I can’t help waving my hands, for I think it can help me express what I want to say better. But my classmates say I look funny and foolish by doing this .
____ I know that it’s not right to speak fast. But I am afraid that I can’t finish my talk in the given time if I speak slowly.
____ Should I talk in American English or British English?
A.Look at the audience (观众) .
Looking at and talking to one person in the audience helps keep you natural, but it feels foolish talking to only one person. Speak to that person as long as 15 seconds and then change another one.
B.Don’t speak too fast!
The audience have a hard time understanding what they hear. They need your help. Slow down, pause(停顿) and guide the audience through your talk. Remember that you should help the audience understand what you are saying.
C.Low your voice!
Make your voice a little lower than normal. Listeners like to a relatively(相对) deep voice.
D.Talk but not recite(背诵) .
When you talk, try to be as natural as possible. Don’t try to memorize your words and read or recite them to your audience. You can use short notes to help you remember the important points.
E. Use simple words.
You should know you and most of the people you talk to are different in many ways . Some of them may not know what you are talking about. Then speak to them on their languages.
F. Word works!
Concentrate on what you want to say. If you are always paying attention to gestures(手势).
G. English has no differences.
It’s true that there are some differences between American English and British English, but they’ll not cause much difficulty for listeners, so just speak the way you’re used to.