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【简答题】
（10分）1，2-二溴乙烷可作汽油抗爆剂的添加剂，常温下它是无色液体，密度2.18g·cm -3 ，沸点131.4℃，熔点9.79℃，不溶于水，易溶于醇、醚、丙酮等有机溶剂。在实验室中可以用图4-3所示装置制备1，2-二溴乙烷。其中分液漏斗和烧瓶a中装有乙醇和浓硫酸的混合液，试管d中装有液溴（表面覆盖少量水）。填写下列空白： (1)写出本题中制备1，2-二溴乙烷的两个化学反应方程式______ ， （2）b可以防止倒吸，并可以检查实验进行时试管d是否发生堵塞，请写出发生堵塞时瓶b中的现象___ ___。 （3）容器c中NaOH溶液的作用是_____ _。 （4）某学生在做此实验时，使用一定量的液溴，当溴全部褪色时，所消耗乙醇和浓硫酸混合液的量，比正常情况下超过许多。如果装置的气密性没有问题，可能的原因有①乙烯发生(或通过液溴)速率过快，② 。
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举一反三
【单选题】The underlined term 'life expectancy' (Para. 1) refers to______.
A.
the length of time for each person
B.
the expectations of a person's life
C.
the seasonal changes in a person's life
D.
the average period that a person may expect to live
【单选题】As an ______ (someone who sets up a business venture), your personal life and business life are interconnected. (Para. 10)
A.
entrepreneur
B.
investigator
C.
subscriber
D.
navigator
【简答题】TLF文本包括3种类型的文本块,它们是只读、可选和可编辑。文本有俩种排列方向,它们是()和()
【单选题】Life in the countryside is quite ____ that in modern cities. [ ]
A.
the same
B.
different from
C.
full of
【单选题】回答下列各题 (II) I am discovering that many people want, above all else, to live life fully. But sometimes the past prohibits our living and enjoying life to the utmost in the present. A school teacher 26 ...
A.
entered
B.
left
C.
rushed
D.
slipped
【单选题】According to Para. 2, the writer thinks that______.
A.
life for a child is comparatively easy
B.
a child is always loved whatever he does
C.
if much is given to a child, he must do something in return
D.
only children are interested in life
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