问题 选择题

下列推断合理的是             [ ]

A.在常温下,Na2SiO3+H2O+CO2 = Na2CO3+H2SiO3↓,说明H2CO3酸性强于H2SiO3;在高温下,Na2CO3+SiO2  =  Na2SiO3+CO2↑,说明H2SiO3酸性强于H2CO3      

B.c(NH4+)相等的(NH42SO4、(NH42CO3、(NH42Fe(SO42溶液,则 c[(NH42SO4]>c[(NH42CO3] >c[(NH42Fe(SO42]      

C.向1L0.3mol/L的NaOH溶液中缓慢通入CO2气体至溶液增重8.8g时,则溶液中2c(Na+)=3[c(HCO3-)+c(CO32-)+c(H2CO3)]

D.在海带中提取碘的实验中既可以用四氯化碳作萃取剂也可以用酒精作萃取剂

答案

答案:C

阅读理解

China Youth says that more and more girl students have entered colleges to study in recent few years. As we know, once the number of boys was larger than that of girls, and the boys did much better than girls in our country for a long time. Now things have changed a lot.

In recent years, the proportion of girl students is growing fast. In 1998, about 39.7% of college students were girls. In 2000, it was 41.07% and in 2001, the number was 42.14%.

There are several reasons for this.

Firstly, there is little difference between boys and girls in their intelligence(智力). That’s to say, girls are as clever as boys. And boys have more interests than girls, so they may not do well in their study.

Secondly, girls are more careful and more sensible than boys. They work harder at school and they do better in all exams.

Another reason is that with the development of society, people pay more and more attention to girls’ education.

小题1:China Youth says that more and more ______

A.boys are cleverer than girls

B.boys can’t go to school

C.girls have entered colleges

D.girls begin to study at school小题2:42.14% refers to the number of _________

A.girls at schools at schools in 1998

B.girls in colleges in 2001

C.boys at schools in 2001

D.boys in colleges in 1998小题3:The writer gave us _________   reasons to explain the question.

A.two

B.three

C.four

D.five小题4:The underlined word “proportion” means _________ in Chinese.

A.身高

B.比例

C.特征

D.速度小题5:Which of the following sentences is TRUE?

A.Boys may not do as well in their study as girls because they don’t like studying.

B.Boys are much cleverer than girls because they’re interested in many things.

C.Girls’ intelligence is the same as boys’.

D.Girls study harder, but they couldn’t get higher marks than boys.

单项选择题