CT平扫钙化率最低的脑肿瘤是（） A.脑膜瘤 B.颅咽管瘤 C.松果体细胞瘤 D.转

阅读理解。

     How words came into being is unknown. All we assume 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 live, 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. 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 then 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. actions

C. signs

D. sounds

2. What is mainly discussed in Paragraph 2?

A. The power of new words

B. The importance of old words

C. The relation of human experience with words

D. The gradual change and development of words

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

A. Use words skillfully

B. Make musical speeches

C. Learn poems by heart

D. Associate with listeners

直埋敷设的电缆与铁路、公路或街道交叉时，应穿于保护管，且保护范围超出路基、街道路面两边以及排水沟边( )以上。

A．0.3m

B．0.5m

C．0.7m

D．1m

欧盟的政治、经济一体化中枢为（）。

A.欧盟理事会

B.欧洲委员会

C.欧洲法院

D.特别理事会

一个地区人口增长模式的转变，主要受到下列哪个因素的影响（）

A.生产力水平

B.社会福利

C.文化观念

D.自然环境