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【多选题】
有机化合物分子中引入硝基取代氢原子而生成硝基化合物的反应，称为硝化。用硝酸根取代有机化合物中的羟基的化学反应，则是另一种类型的硝化反应，产物称为硝酸酯。硝化反应是生产染料、药物及某些炸药的重要反应。硝化反应的主要危险性有（ ）。A.
硝化反应的中间体，特别是硝基化合物还原反应的中间体，也有一定的火灾危险，例如，邻硝基苯甲醚还原为邻氨基苯甲醚过程中，产生l50。CT可自燃的氧化偶氮苯甲醚
B.
硝化反应是放热反应，温度越高，硝化反应的速度越快，放出的热量越多，越极易造成温度失控而爆炸
C.
被硝化的物质大多为易燃物质，有的兼具毒性，如苯、甲苯、脱脂棉等，使用或储存不当时，易造成火灾
D.
混酸具有强烈的氧化性和腐蚀性，与有机物特别是不饱和有机物接触即能引起燃烧。硝化反应的腐蚀性很强，会导致设备的强烈腐蚀
E.
硝化产品大都具有火灾、爆炸危险性，尤其是多硝基化合物和硝酸酯，受热、摩擦、撞击或接触点火源，极易爆炸或着火
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【单选题】To an advertiser, which one should they pay more attention to?
A.
Understanding of a language.
B.
Ability to speak a language.
C.
Obvious differences between languages.
D.
The different idiomatic expressions between languages.
【单选题】From this lecture, what can be inferred about the relationship between nurture and language acquisition?
A.
Preschoolers' interaction with adults has no effect on their communication skills.
B.
Toddlers are unable to communicate because they haven't learned the rules of grammar yet.
C.
Babies should be exposed to situations where language is modeled so that they can learn to use it.
D.
Children who imitate sounds or words are not really communicating meanin
【简答题】The concept competence originally refers to the grammatical knowledge of the ideal language user and has nothing to do with the actual use of language in concrete situation.(南开大学2004研)
【单选题】A good title for this selection is ______.
A.
The French and Indian War
B.
The English language
C.
Washington's army
D.
The French and British War
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