问题 选择题

短周期元素X,其原子最外层中未成对电子数最多,该元素的氢化物是常见的10电子极性分子,下列说法不正确的是

A.该元素位于周期表的第VA族

B.同主族元素形成的氢化物中,其熔、沸点最低
C.该元素的氢化物与其最高价氧化物的水化物形成的化合物中既含有离子键还含有极性键和配位键
D.该元素的单质中含有一个σ键和两个π键

答案

答案:B

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.

It can be conclude from the passage that newspaper readers ().

A. apply reading techniques skillfully

B. jump from one newspaper to another

C. appreciate the variety of a newspaper

D. usually read a newspaper selectively

单项选择题