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Getting rid of dirt, in the opinion of most people, is a good thing. However, there is nothing fixed about attitudes to dirt. In the early 16 th century, people thought that dirt on the skin was a means to block out disease, as medical opinion had it that washing off dirt with hot water could open up the skin and let ills in. A particular danger was thought to lie in public baths. By 1538, the French king had closed the bath houses in his kingdom. So did the king of England in 1546. Thus began a long time when the rich and the poor in Europe lived with dirt in a friendly way. Henry IV, King of France, was famously dirty. Upon learning that a nobleman had taken a bath, the king ordered that, to avoid the attack of disease, the nobleman should not go out. Though the belief in the merit of dirt was long-lived, dirt has no longer been regarded as a nice neighbor ever since the 18 th century. Scientifically speaking, cleaning away dirt is good to health. Clean water supply and hand washing are practical means of preventing disease. Yet, it seems that standards of cleanliness have moved beyond science since World War Ⅱ. Advertisements repeatedly sell the idea; clothes need to be whiter than white, cloths ever softer, surfaces to shine. Has the hate for dirt, however, gone too far? Attitudes to dirt still differ hugely nowadays. Many first-time parents nervously try to warn their children off touching dirt, which might be responsible for the spread of disease. On the contrary, Mary Ruebush, an American immunologist(免疫学家),encourages children to play in the dirt to build up a strong immune system. And the latter position is gaining some ground. 小题1:The kings of France and England in the 16 th century closed bath houses because . A.they lived healthily in a dirty environment. B.they thought bath houses were to dirty to stay in C.they believed disease could be spread in public baths D.they considered bathing as the cause of skin disease 小题2:Which of the following best describes Henry IV’s attitude to bathing? A.Afraid. B.Curious. C.Approving. D.Uninterested. 小题3:How does the passage mainly develop? A.By providing examples. B.By making comparisons. C.By following the order of time. D.By following the order of importance. 小题4:What is the author’s purpose in writing the passage? A.To stress the role of dirt. B.To introduce the history of dirt. C.To call attention to the danger of dirt. D.To present the change of views on dirt.
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【判断题】中国共产党十七届三中全会于2008年10月9日至12日在北京举行,全会通过了《中共中央关于推进农村改革发展若干重大问题的决定》。
A.
正确
B.
错误
【简答题】中国十七届三中全会于2008年10月9日至12日在北京举行,会议通过了中央关于推进_____若干重大问题的决定。
【简答题】(1)写出硫酸铁在水溶液中电离的电离方程式______ (2)用双线桥法,标出下列氧化还原反应的电子转移方向和电子总数 2FeCl 3 +Fe=3FeCl 2 氧化剂是______(填化学式) (3)氨的催化氧化是工业上制硝酸的基础:4NH 3 +5O 2 催化剂 . △ 4NO+6H 2 O,其中作为还原剂的物质是______(填化学式);若反应中生成了0.2molNO,则转移______mol...
【多选题】原子X转移2个电子给原子Y,形成化合物XY,下列说法正确的是 [     ]
A.
Y被氧化了
B.
X是氧化剂
C.
X发生氧化反应
D.
Y具有氧化性
【判断题】中国共产党十七届三中全会于10月9日至12日在北京举行,全会通过了《中共中央关于推进农村改革发展若干重大问题的决定》。
A.
正确
B.
错误
【单选题】原子X转移两个电子给Y,形成化合物XY,下列说法中正确的是(  )
A.
X被氧化了
B.
X是氧化剂
C.
X发生还原反应
D.
Y在反应中表现了还原性
【单选题】中国共产党第十七届中央委员会第三次会议于2008年10月9日至12日在北京举行,全会审议通过了《中共中央关于推进( )若干重大问题的决定》。
A.
农村土地改革
B.
农民社会保障
C.
农业税费改革
D.
农村改革发展
【单选题】原子X转移一个电子给原子Y,形成化合物HY,下列说法正确的是(   )
A.
X被氧化了
B.
X是氧化剂
C.
X发生还原反应
D.
Y在反应中表现了氧化性
【简答题】(1)写出硫酸铁在水溶液中电离的电离方程式 (2)用双线桥法,标出下列氧化还原反应的电子转移方向和电子总数 2FeCl 3 +Fe=3FeCl 2 氧化剂是 (填化学式) (3)氨的催化氧化是工业上制硝酸的基础:4NH 3 + 5 O 2 4NO + 6H 2 O ,其中作为还原剂的物质是 (填化学式);若反应中生成了0.2 mol NO,则转移 mol电子, (4)在一定条件下,RO 3 n- ...
【单选题】下列说法正确的是(  )
A.
当7.8g Na 2 O 2 与H 2 O完全反应时,有0.2mol电子发生了转移
B.
FeCl 2 溶液与K 3 [Fe(CN) 6 ]溶液混合后得到特征蓝色沉淀,利用此反应可检验Fe 2+
C.
用浓盐酸酸化KMnO 4 溶液以增强其氧化性
D.
在3NO 2 +H 2 O=2HNO 3 +NO中,氧化剂和还原剂的质量比为2:1
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