问题 填空题

漂白粉在社会生活、工业生产中用途广泛,漂白粉除了具有漂白作用外,还能杀菌消毒。

(1)2011年3月11日13时46分,日本发生9.0级地震,给地震灾区的人民造成了巨大的生命和财产损失。震灾过后,饮用水的消毒杀菌成为抑制大规模传染性疾病爆发的有效方法之一。漂白粉是常用的消毒剂。

①工业上将氯气通入石灰乳[Ca(OH)2]中制取漂白粉,化学方程式为_________________。漂白粉的有效成分是__________。

②漂白粉应密封并置于阴暗处保存,请用化学方程式说明其中的原因:_____________、_____________

(2)已知浓盐酸和次氯酸钙能发生如下反应:Ca(ClO)2+4HCl(浓)=CaCl2+2Cl2↑+2H2O。用贮存很久的漂白粉与浓盐酸制得的氯气中,可能含有的杂质气体是_________。

①CO2 ②HCl ③H2O ④O2

A.①②③ B.②③④ C.②③ D.①④

答案

(1)①2Cl2+2Ca(OH)2=CaCl2+Ca(ClO)2+2H2O;Ca(ClO)2;②Ca(ClO)2+CO2+H2O=CaCO3↓+2HClO;

2HClO2HCl+O2

(2)A

完形填空
Do you want to be successful in everything you do? If so, then how? Here is an example.
There was a farmer who   36  corn(玉米)all his life. Each year he took his corn to the market. Then each time his corn was chosen as the   37  and won the first prize.
One year a newspaper reporter interviewed him and learned something surprising about how he grew it. The farmer   38  his seed(做种子的) corn to his neighbors.
"How can you share your best seed corn with your neighbors?" the reporter asked. "You know they are taking part in the   39  with you each year."
"Why, sir," said the farmer, "didn't you know? The   40  picks up pollen (花粉) from the corn and moves it quickly from field to field. If my neighbors grow   41  corn, cross-pollination (异花传粉) will affect the quality of my corn. So if I want to grow good corn, I must help my neighbors to grow good corn. "
The farmer knows much about the connection of life. His corn cannot improve unless his neighbor's corn improves.
As a great man says, "We make a living by what we grow; we make a life by what we give." We can't   42  without food, clothes, and many other things. However, a meaningful life is not decided by how much we can get,   43  by how much we can give others. Giving, instead of taking, makes us    44   from other animals.
So those who choose to live well must help others to live well and those who choose to be happy must help others to find   45  in their life.
小题1:
A.grewB.boughtC.soldD.collected
小题2:
A.cheapestB.prettiestC.bestD.shortest
小题3:
A.lentB.showedC.offeredD.recommended
小题4:
A.gameB.fightC.experimentD.competition
小题5:
A.windB.waterC.farmerD.neighbor
小题6:
A.tastyB.badC.tallD.unusual
小题7:
A.cheerB.moveC.workD.live
小题8:
A.andB.butC.orD.so
小题9:
A.differentB.free C.safeD.far
小题10:
A.hopeB.successC.friendshipD.happiness
问答题