问题 选择题

向一定量的Fe、FeO和Fe2O3的混合物中加入240 mL4 mol·L1的稀硝酸,恰好使混合物完全溶解,放出2.688L NO(标准状况),往所得溶液中加入KSCN溶液,无红色出现。若用足量的氢气还原相同质量的混合物,能得到铁的物质的量(  )

A.0.48 mol

B.0.42mol

C.0.32 mol

D.0.28 mol

答案

答案:B

根据题意可知,生成物全部是硝酸亚铁。被还原的硝酸是2.688L÷22.4L/mol=0.12mol,所以没有被还原的硝酸是0.96mol-0.12mol=0.84mol,则生成硝酸亚铁是0.42mol,所以最终生成的铁的物质的量是0.42mol,答案选B。

阅读理解

The art of reading fiction is largely a matter of inferring meanings. To infer means to understand facts which are not directly stated---only suggested. Inference is one of the commonest ways of knowing things: a child holds his knee and cries; this action implies his feeling; an observer infers that the child is hurt. To infer accurately in everyday life requires caution in observing; to infer skillfully in fiction requires caution in reading; both require disciplined imagination.

The short-story reader can expect to find certain basic elements in any story. For example, all stories involve a person or persons, in a particular setting, faced with a demand for a response. The response called for may be a physical action, such as defeating an adversary(对手) or escaping from a danger; or it may be a mental action, such as adjusting to others or within oneself. In either case, the short story is a description in two ways: first, it shows the motives for a given human action; second, it makes a point about the general human situation. Such descriptions, however, rather than being stated directly, usually are implied by the elements of the story.

When the reader of a story understands all the facts and their interrelationships, he is ready to infer the significance of the story as a whole---its comment on the human situation. This comment, or theme, is the seed from which the story grew. It is also the idea by which all the separate elements of the story are governed, while these in turn further shape and modify the theme. In addition to action, character, and setting, these elements include structure, mood, tone, and point of view.

Fiction reading requires an awareness of all the ways in which a story communicates. It also requires attention to detail. What the author provides is a network of points which serve as clues to his meaning. He invites the reader to develop the meaning by inference, actually to create much of the story himself and so make it part of his own experience.

小题1:According to the author, "infer" means ________ .

A.knowingfactsbeyondthestatement

B.lookingformoreevidencesforthestatement

C.findingoutadifferentmeaningfromthestatement

D.addingsomefactstothestatement小题2:What is inferring in fiction based on?

A.Readers’guessing.

B.Thebasicelementsofthestory.

C.Thesettingofthestory.

D.Theinterrelationshipsbetweenpeopleinthestory.小题3:What is the implied meaning of the last sentence?

A.Inferringcanreallyhelpthereaderdevelopimaginationandenrichhimself.

B.Inferringcanhelpthereaderwriteastoryofhisown.

C.Thereadershouldlookforanexperiencedescribedinthestoryhereads.

D.Theexperiencedescribedinthestorywillleaveagreatimpactonitsreader.小题4:What is the main idea of this passage?

A.Inferringisanartofwriting.

B.Inferringisaneedinfictionwriting

C.Inferringisthebasicskillinreadingfiction.

D.Inferringiscommoninreading.

单项选择题