将某温度下的饱和石灰水：①加入少量生石灰后恢复的原来温度；②降低温度。这两种情况

我们在市场上经常看见许多水果，如热带的香蕉、亚热带的柑橘、温带的苹果等，这主要是由于我国

A．跨纬度较广

B．跨经度较广

C．面积广大

D．地形复杂

计算机中除声音和图像外的信息都是采用二进制编码表示。

阅读理解

     How words came into being is unknown. All we assume(推测)is that some early men invented

certain sounds, in one way or another, to express thoughts and feelings, actions and things, so that

they could talk with each other. Later they agreed upon certain signs, called letters, which could be

put together to show those sounds, and which could be written down. Those sounds, whether spoken

or written in letters, are called words.

     The power of words, then, lies in their associations - the things they bring up to our minds. Words

become filled with meaning for us by experience; and the longer we tire, the more certain words bring

back to us the happy and sad events of our past; and the more we read and learn, the more the number

of words that mean something to us increases.

     Great writers are those who not only have great thoughts but also express these thoughts in words

which have powerful effects on our minds and feelings. This clever use of words is what  we call literary

style(文体). Above all, the real poet is a master of words. He can express 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 correctly, or they will make our speech silly and

common.

1. We learn from the text that language might have begun with         .

A. expressions      

B. sounds      

C. signs        

D. actions

2.What is mainly discussed in Paragraph 2?

A. The relation of human experience with words.    

B. The importance of old words

C. The gradual change and development of words.  

D.The learning of new words.

3. In the last paragraph, what does the author suggest that we should do? 

A.Learn poems by heart.                  

B. Make musical speeches

C. Use words skillfully.                  

D. Associate with listeners.

我国古代医德，无论是医疗，还是护理，主要受到哪家思想的影响（）。

A.道家

B.儒家

C.法家

D.墨家

E.儒家和道家

克隆源性细胞在特定的生长环境内有能力形成细胞集落至少是（）。

A.30个

B.40个

C.50个

D.60个

E.70个