尿素酶试验阳性结果是（） A.黄色 B.红色 C.黑色 D.绿色 E.蓝色

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 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 (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. actions

C .signs  

D. sounds

2.What is mainly discussed in Paragraph 2?

A. The learning 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 skilfully.

B. Make musical speeches.

C. Learn poems by heart.

D. Associate with listeners.

以下关于水痘的说法正确的是（）

A.第一批疱疹结痂即传染性消失

B.出疹前2天始有传染性

C.从出疹后始有传染性

D.从出疹前1天即有传染性

E.出疹后传染性即消失

处理短消息中心问题的三个维护工具是（），（），（）

早期缺铁性贫血形态学改变为

A．小细胞低色素性贫血

B．小细胞正色素性贫血

C．正细胞正色素性贫血

D．大细胞性贫血

E．以上都不是

高额损失原则是指某一风险事故发生的频率( )。

A．很高，应优先投保

B．虽然不高，但造成的损失严重，应优先投保

C．很高，保险人应拒绝承保

D．虽然不高，但造成的损失严重，保险人应拒绝承保