A：在稀氨水中通入少量CO2：NH3·H2O＋CO2===NH＋HCO
B：向次氯酸钙溶液通入SO2：Ca2++2ClO-+SO2+H2O= CaSO3↓+2HClO
C：过量的NaHSO4与Ba(OH)2溶液反应：Ba2+十OH-十H+十SO42—＝BaSO4↓ 十2H2O
D：在氯化亚铁溶液中加入稀硝酸：3Fe2++4H++NO3-=3Fe3++NO↑+2H2O
注意：1）请勿提及与考生有关的真实信息；
2）可以适当增加细节，使行文连贯；
3）词数100左右；开头已给出，不计入总词数。
Different Views on Square Dance
70% Yes
30% No
·Square dance is easy and free to learn.
·It can be performed in many places.
·It helps people look good and feel good.
·It offers chances to make friends.
·Square dance occupies public places.
·It makes big noises and disturbs others' lives.
·It is not attractive to young people.
Your opinion…
Recently we have conducted a survey of square dance in our hometown.
在讲解某个思想概念时，有位教师引用了这几句话：“国家的意志是全社会的意志，每个公民在投票时，是一项神圣的举动，投票就是奉献自己……全体公民精神相通，死生与共。”据此，推测这个思想概念有可能是（ ）
两个小数相乘，所得的积一定比其中一个数大。
