问题 填空题

(11分)电解法制烧碱的原料是饱和食盐水,由于粗盐中含有泥沙和Ca2+、Mg2+、Fe3+、SO42-杂质,不符合电解要求,因此必须经过精制。某校实验小组精制粗盐水的实验过程如下:

请回答以下问题:

(1)操作a的名称是____________。

(2)在Ⅱ步中,加入过量试剂甲后,生成了两种大量的沉淀,则试剂甲为________溶液。试剂乙为         ,固体F为                       

(3)在第Ⅴ步中,加入试剂丁直到溶液无明显变化时,写出此过程的化学方程式                                                                      _  

答案

(1)过滤(1分)(2)NaOH、BaCl2、CaCO3和BaCO3(每空2分)(3)NaOH + HCl =" NaCl" + H2O       Na2CO3 + 2HCl =" 2NaCl" + H2O + CO2↑(每空2分)

单项选择题

With the spread of inter-active electronic media a man alone in his own home will never have been so well placed to fill the inexplicable mental space between cradle and crematorium. So I suspect that books will be pushed more and more into those moments of travel or difficult defecation (1) people still don’t quite know what to do with.

When people do read, I think they’ll want to feel they are reading literature, or (2) something serious. (3) you’re going to find fewer books presenting themselves as no- nonsense and (4) assuming literary pretensions and being packaged as works of art. We can expect an extraordinary variety of genre, but with an underlying (5) of sentiment and vision.

Translators can only (6) from this desire for the presumably sophisticated. We can look forward to lots of difficult names and fantastic stories of foreign parts enthusiastically (7) by the overall worship of the "global village" Much of this will be awful and some wonderful, (8) don’t expect the press or the organizers of prizes to offer you much help in making the appropriate distinctions. They will be chiefly (9) in creating celebrity, the greatest enemy of discrimination, but a good prop for the (10) consumer.

Every ethnic grouping over the world will have to be seen to have a great writer--a phenomenon that will (11) a new kind of provincialism, more chronological than geographic, (12) only the strictly contemporary is talked about and (13) . Universities, including Cambridge, will include (14) their literature syllabus novels written only last year. (15) occasional exhumation for the Nobel, the achievements of ten or only five years ago will be largely forgotten.

In short, you can’t go too far wrong when predicting more of the same. But there is a (16) side to this--the inevitable reaction against it. The practical things I would like to see happen--publishers seeking less to (17) celebrity through extravagant advertising, (18) and magazines (19) space to reflective pieces--are rather more improbable than the Second Coming (耶稣复临). But dullness never quite darkens the whole planet. In their own idiosyncratic fashion a few writers will (20) be looking for new departures.

15()

A.Given

B.Considering

C.Barring

D.Concerning

单项选择题