问题 单项选择题

A good modern newspaper is an extraordinary piece of reading. It is remarkable first for what it contains the range of news from local crime to international politics, from sports to business to fashion to science, and the range of comment and special features (特定) as well, from editorial page to feature articles and interviews to criticism of books, art, theatre and music. A newspaper is even more remarkable for the way one reads it never completely, never straight through, but always by jumping from here to there, in and out glancing at one piece, reading another article all the way through, reading just a few paragraphs of the next.
A good modern newspaper offers a variety to attract many different readers, but far more than any one reader is interested in. What brings this variety together in one place is its topicality (时事性), its immediate relation to what is happening in your world and your locality now. But immediacy and the speed of production that goes with it mean also that much of what appears in a newspaper has no more than transient (短暂的) value.
For all these reasons, no two people really read the same paper: what each person does is to put together out of the pages of that day’s paper, his own selection and sequence, his own news paper. For all these reasons, reading newspapers efficiently, which means getting what you want from them without missing things you need but without wasting time, demands skill and self-awareness as you modify and apply the techniques of reading.

A good newspaper offers a variety to readers because ______.

A. it tries to serve different readers
B. it has to cover things that happen in a certain locality
C. readers are difficult to please
D. readers like to read different newspapers

答案

参考答案:A

解析:本题是细节题。依据文章中间“A good modem newspaper offers a variety to attract many different readers, but far more than any one reader is interested in.”可以看出,报纸提供各种各样的内容,是为了满足不同类型、有不同阅读需求的读者。所以A选项正是正确答案。

问答题

钢铁是使用最多的金属材料.

(1)铁制品锈蚀的过程,实际上是铁与______发生化学反应的过程.铝比铁活泼,但铝具有很好的抗腐蚀性能,其原因是______.

(2)将磁铁矿(主要成分是Fe3O4)冶炼成铁的化学方程式是______.生铁冶炼成钢的过程中,含碳量适当______(选填“升高”或“降低”).

(3)实验室模拟炼铁原理进行实验,得到的尾气是CO和CO2的混合气体.现欲利用如图装置将该混合气体进行分离,图中a、b、c、d均为活塞.

①检查装置的气密性.

甲、乙、丙装置内放入一定量水,使长导管口浸没在水面以下,关闭b、c,打开a、d,并在最右端导管口接注射器.当向外缓慢拉动注射器活塞时,如果整套装置气密性良好,则能观察到的现象是______.

②分离CO和CO2的混合气体.

可供选择的试剂有:稀硫酸、浓硫酸、氢氧化钠溶液、澄清石灰水.

步骤Ⅰ:关闭b、c,打开a、d,缓缓通入混合气体,甲中发生反应的化学方程式为

______;若乙装置中的现象是______,说明甲装置中的反应是充分的;丙中试剂为______.通过此步实验,分离出的气体是______.

步骤Ⅱ:关闭______,打开______,让分液漏斗中的稀硫酸缓缓流下至不再产生气泡时,关闭b.通过此步实验,即可分离出另一种气体.

(4)铁元素可以形成3种氧化物,分别是FeO、Fe2O3和Fe3O4.取29g的固体样品,在高温时与足量CO充分反应,生成的气体被足量澄清石灰水吸收,得到50g沉淀.由此分析,原样品可能是______(选填字母).

A.Fe2O3B.Fe3O4C.FeO和Fe3O4的混合物D.Fe2O3和FeO的混合物.

单项选择题