题干

根据元素周期律,由列事实进行归纳推测,推测不合理的是事实(   )

 事实

 推测

 A

12Mg与水反应缓慢,20Ca与水反应较快

56Ba(IIA族)与水反应更快

 B

 Si是半导体材料,同族Ge也是半导体材料

Ⅳ族的元素都是半导体材料,

 C

 HCl在1500℃时分解,HI在230℃时分解

 HBr的分解温度介于二者之间

 D

 Si与H2高温时反应,S与H2加热能反应

 P与H2在高温时能反应

A:A  

B:B  

C:C  

D:D

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答案(点此获取答案解析)

B

同类题2

完形填空

     George selected his food in Value Mart carefully. He estimated he had180cents today.He was pleased he had got good2for his money again.

      At the exit,the freezing wind3him of his gloves.He was sure he was wearing them whenentering the4.He made a search of his pockets.Then he thought theymust have been5somewhere in the store.George had bought the blackgloves for $35 ten years ago.They were leather,softand durable.Until then,hehad worn cheaper man­made material that never lasted long.His6to buythe gloves turned out to be good,whicheven7his position on the bus,aspoorer passengers stared at him8.

      George re­entered the store.He followed the same9he had walked before,10at the bread counter,to the dairy section,to the shelf where salt and sugar wereplaced.It did not take long to be11that the gloves were notthere.His12grew heavier.“People have changed,” he13.“Years ago,if somebody14something lost,they would give it back.”

      Ye the did not give up.This time he focused on the gloves on other shoppers’ 15.Suddenly he16a ladynearby wearing a black pair of gloves.He said,“Hi!” But when the surprised lady returnedhis17,hiseyes dropped to the floor,forthe fingers of her gloves were too small for him.

     Without gloves,hehad to18his hands into his sleeves.Back home,George was19.He could notdo without gloves.George decided to buy another leather pair.But before that,he stepped into Value Mart again tosee if by any20his gloves had been returned to the lost and foundoffice.The girl looked into her drawer and took out a pair of men’s leathergloves.“Are they?”

“Yes! Mine !”George shouted with joy.

同类题3

阅读下文,回答相关问题。

     【甲】余幼时即嗜学。家贫,无从致书以观,每假借于藏书之家,手自笔录,计日以还。天大寒,砚冰坚,手指不可屈伸,弗之怠。录毕,走送之,不敢稍逾约。以是人多以书假余,余因得遍观群书。既加冠,益慕圣贤之道,又患无砚师、名人与游,尝趋百里外,从乡之先达执经叩问。先达德隆望尊,门人弟子填其室,未尝稍降辞色。余立侍左右,援疑质理,俯身倾耳以请;或遇其叱咄,色愈恭,礼愈至,不敢出一言以复;俟其欣悦,则又请焉。故余虽愚,卒获有所闻。

     【乙】年二十,不好学,游荡无度,或以为痴。尝得瓜果,辄进叔母任氏①。任氏曰:“《孝经》云:‘三牲之养,犹为不孝②。’汝今年余二十,目不存教,心不入道③,无以慰我。”因叹曰:“昔孟母三徙以成仁,曾父烹豕以存教,岂我居不卜④邻,教有所阙⑤,何尔鲁钝之甚也!修身笃学,自汝得之,于我何有!”因对之流涕。谧乃感激,就乡人席坦受书,勤力不怠。
      居贫,躬身稼穑,带经⑥而农,遂博综典籍⑦百家之言。沉静寡欲,始有高尚之志,以著述为务,自号玄晏先生。著《礼乐》、《圣真》之论。

                                                                                                                                                          (选自《晋书·皇甫谧传》)
      注释①叔母任氏:指抚养他的任姓叔母。②三牲之养,犹为不孝:意为即使每天给父母吃牛、羊、猪(三牲)肉,仍称不上是孝子。③道:正道。④卜:此指选择。⑤阙:同“缺”。⑥经:此指儒家经典著作。⑦博综典籍:博览儒家经典著作,