问题 实验题

在做研究平抛运动的实验时,让小球多次沿同一轨道运动,通过描点法画出小球平抛运动的轨迹。

(1)为了能较准确地描绘运动轨迹,下面列出一些操作要求,将你认为正确选项的前面字母填在横线上:___________。

A. 通过调节使斜槽的末端保持水平

B. 每次释放小球的位置必须不同

C. 每次必须由静止释放小球

D. 小球运动时不应与木板上的白纸(或方格纸)相接触

E. 将球的位置记录在纸上后,取下纸,用直尺将点连成折线

(2)在该实验中,某同学记录了A、B、C三点,取A点为坐标原点,建立了如图所示的坐标系。平抛轨迹上的这三点坐标值图中已标出。那么A、B两点的时间间隔是___________,小球平抛的初速度为___________。

答案

(1)ACD

(2)0.1s,1m/s

阅读理解

How men first learned to invent words is unknown, in other words, the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain sounds to express thoughts and feelings, actions and things, so that they could communicate with each other; and that later they agreed upon certain signs, called letters, which could be combined to represent those sounds and which could be written down. Those sounds, whether spoken, or written in letters, we call words.

The power of words, then, lies in their association—the thing they bring up before our minds. Words become filled with meaning for us by experience; and the longer we live, the more certain words recall to us the glad and the sad events of our past; and the more we read and learn, the more the number of words that mean something to us increase.

Great writers are those who not only have great thoughts but also express these thoughts in words which appeal powerfully to our minds and emotions. This charming and telling use of words is what we call literary style. Above all, the real poet is a master of words. He can convey his meaning in words which sing like music, and which by their position and association can move men to tears. We should, therefore, learn to choose our words carefully and use them accurately, or they make our speech silly and vulgar.

小题1:What is the origin of language?

A.It is unknown.

B.It is a matter that is unclear.

C.It is a question difficult to answer.

D.It is a problem not yet solved.小题2:Which of the following about a real poet is NOT true?

A.He is less than a master of words.

B.His style is always charming.

C.His poem can move men to tears.

D.He can express his ideas in words that sing like music.小题3:Where does the real power of the words come from?

A.From the words themselves.

B.From their characteristics.

C.From their peculiarity.

D.From their association.小题4:What is the main idea of the passage?

A.The importance of choosing words.

B.Where the real power of words come from.

C.What great writers are like.

D.We should learn to choose words carefully.

单项选择题