问题 选择题

下列说法不正确的是

A.常温下,氧气与所有金属都能反应

B.棉花属于天然有机高分子材料

C.结晶水合物属于纯净物

D.中和反应一定有盐和水生成  

答案

答案:A

A、常温下,氧气不与金等反应,故A说法不正确;

B、棉花属于天然有机高分子材料,故B说法正确;

C、结晶水合物属于纯净物,故C说法正确;

D、中和反应是指酸和碱反应生成盐和水的反应,故D说法正确。

完形填空
完形填空。
     Do you know who invented tea? In fact, tea, the most popular drink in the world ( after water) , was
invented by accident. According to an ancient Chinese legend, the Emperor Shen Nong   l   tea when he
was boiling drinking water over an open fire. Some leaves from a nearby bush fell into the water and
remained there for some time. The Emperor noticed that the leaves in the water produced a  2   smell.
Later he decided to taste the hot mixture. It was quite delicious. And _3   , one of the world's favorite
drinks was invented.
      China is the home of tea, which has more than 4,000 years history.  People throughout(遍及) China
drink tea daily.   4   the three major drinks-tea, coffee and cocoa, tea is drunk by the largest number of
people in the world.  Tea from China, along    5__silk and porcelain(瓷器) , began to be known by the
world over a thousand years ago and has been an important Chinese export(出口)    6   .
      Tea leaves are produced mainly in the area south of the Yangtze River, in the provinces of Zhejiang,
Jiangxi and Fujian, because of the mild(温暖的)   7   and rich soil there. Longjing, Wulong, Pu'er and
Tieguanyin are all   8 _ kinds of tea.
      Over the past centuries, Chinese people   9__ their unique (特有的)  tea culture,  which includes tea
planting, tea-leaf picking, tea making and so on. Tea is    10    a popular topic which is often mentioned
in dances, songs, poems and novels.
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B. found out    
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B. with          
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B. weather      
B. important    
B. have developed
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C. Of          
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C. since then  
C. condition  
C. famous      
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D. tried out          
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D. By                
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D. since now        
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判断题