在相同温度下，等体积、等物质的量浓度的下列溶液①Na2SO4、②H2SO3、③N
题型：选择题
问题：
在相同温度下，等体积、等物质的量浓度的下列溶液①Na2SO4、②H2SO3、③NaHSO3、④Na2S中，所含带电微粒数由多到少的顺序为（ ）
A ④＞①＞③＞② B ①＞④＞③＞②
C ①＝④＞②＝③ D ④＝①＞③＞②
题型：选择题
阅读理解。
Most people in Britain live in small family groups. More than a quarter of houses in Britain have only got
one person in them. Some of these are old people but some are people of twenty to thirty who choose to live
alone. 35% of houses have two people in them, and another 17% have three people. 15% have four people in
them, and the other homes have five or more. The families in Britain are small. It is unusual for parents to have more than two children. When children are about eighteen or nineteen, they leave their parents' home, and they
often go to a different city. Sometimes they only visit their parents two or three times a year.
1. How many houses in Britain have 3 people living in them?
A. 8% of houses.
B. 15% of houses.
C. 17% of houses.
D. 35% of houses.
2. At what age do children in Britain usually leave their parents' home?
A. About 18 or 19.
B. About 20 or 21.
C. About 25 or 26.
D. About 30 or 31.
3. What do you think the passage is?
A. An instruction.
B. A report.
C. A play.
D. A joke.
4. What does the passage mainly tell us?
A. Young people in Britain.
B. Old people in Britain.
C. Families in Britain.
D. The population in Britain.
5. According to the passage, which of the diagrams is right?
