问题 选择题

下列工农业生产、日常生活中化学知识的应用不合理的是(  )

A.只饮用纯净水,才有利于人体健康

B.使用乙醇汽油,减少汽车尾气污染

C.食盐除了可用作调味品外,还可作化工原料

D.用食醋除去水壶中的水垢

答案

A、纯净水中除氢、氧外,几乎不含人体所需的营养元素,所以错误.

B、使用乙醇汽油不但可以节约化石能源,还可以减少环境污染,所以正确.

C、氯化钠用途广泛,可以作调味品,配生理盐水,农业上用于选种,生活中用于食品防腐,还可以作为化工原料制碳酸钠、氢氧化钠、盐酸等,所以正确.

D、食醋中含有醋酸,水壶中的水垢主要成分是碳酸钙,醋酸能与碳酸钙反应生成可溶的醋酸钙、水、二氧化碳气体,所以正确.

故选A.

完形填空
Sometimes, people are required to fill in personal information when they register online, which may lead to some unexpected trouble. Recently, the BBC is reporting that a 17-year-old girl in Australia posted a(n)  36  of her grandmother at home counting a large sum of cash that she   37   hidden in the house. Just eight hours later, two armed men   38  the girl’s house. They demanded to speak to her to find out where the grandmother’s house was,   39  they could get the money they had seen.    40  , the girl was not home at the time, so the robbers   41  a small amount of cash from the mother and left.
Because the   42  is still under investigation, local police aren’t saying   43  else about it. It’s not known yet whether the girl had used privacy setting on the Facebook profile page, and even whether the robbers   44  the girl in the past.
Two other   45  were at home then, a 58-year-old man and a 14-year-old boy, the girl’s father and brother. Luckily, no one was   46  . The robbers left peacefully after   47  that the girl was not home and that no one else there knew anything about the   48  that had appeared in the photo.
Police in both Britain and Australia are using the case to  49  citizens of the dangers of posting personal information on social networks and to suggest users of websites   50   doing so. The police say it is   51   that the girl posted a comment in the past that gave clues to the address,    52  that the robbers knew the girl in another way.    53  , they suggest, a posting by a friend on their site could have    54  such information. To find it, the robbers would only have had to search for those posting on other pages that   55  the girl’s name.
小题1:
A.pictureB.storyC.blogD.video
小题2:
A.keptB.madeC.letD.got
小题3:
A.knocked atB.looked atC.broke intoD.ran into
小题4:
A.even ifB.so thatC.as soon asD.in case
小题5:
A.UsuallyB.SuddenlyC.FortunatelyD.Finally
小题6:
A.spentB.leftC.askedD.took
小题7:
A.robberB.familyC.caseD.girl
小题8:
A.fewB.manyC.littleD.much
小题9:
A.ignoredB.knewC.rememberedD.followed
小题10:
A.membersB.adultsC.charactersD.neighbors
小题11:
A.escapedB.harmedC.killedD.buried
小题12:
A.showingB.realizingC.discoveringD.recognizing
小题13:
A.cashB.grandmotherC.houseD.website
小题14:
A.informB.accuseC.robD.warn
小题15:
A.enjoyB.stopC.keepD.consider
小题16:
A.possibleB.importantC.necessaryD.strange
小题17:
A.soB.orC.andD.but
小题18:
A.BesidesB.HoweverC.ThereforeD.Instead
小题19:
A.taken upB.set upC.put awayD.given away
小题20:
A.includedB.drewC.containedD.attracted
单项选择题 A1型题