常用的子宫输卵管造影的对比剂是（） A.20％碘化油 B.40％碘化油 C.50％泛

Last year, some groups of students in their community (社区) made a survey about "How do people spend their free time?" The following diagrams show some results of it:

Diagram (1): Hours for people of different ages who surf the Internet in a week.

Diagram (2): Different days people go to the library. (library attendance)

Diagram (3): Different programs people like.

根据上面三个图表内容，选择正确答案。

小题1:People aged        spend the most time surfing the Internet every week.

A．7—16

B．17—30

C．31—55

D．over 56小题2:The word "attendance" in Diagram (2) means "           in the library".

A．the hours people spend

B．the number of people

C．the number of books

D．the days people spend小题3:On weekends,           people go to the library every week.

A．over sixty

B．less than sixty

C．about twenty

D．more than one hundred小题4:Which of the following is true according to the diagrams?

A．The fewest people like watching music.

B．Sports are the most people's favorite programs.

C．People seldom go to the library on weekdays.

D．Half of the people like watching news or cartoons.小题5:The three diagrams show us the results of a survey about          .

A．what people do every day

B．how people spend their free time

C．people's different lifestyles

D．people's different habits

缓冲溶液能对溶液的（）起稳定作用。

A．浓度

B．电离度

C．酸度

D．平衡常数

选择性旅游的形式等同于小包价旅游中的可选择性部分。()

在腺样囊性癌中，肿瘤性肌上皮细胞产物在电镜下的结构由外向内分布为（）。

A.基板、星状颗粒黏液样物、胶原纤维

B.星状颗粒黏液样物、胶原纤维、基板

C.胶原纤维、基板、星状颗粒黏液样物

D.星状颗粒黏液样物、基板、胶原纤维

E.基板、胶原纤维、星状颗粒黏液样物

货币市场乃至整个金融市场的指标利率是指（）。

A.短期国债利率

B.债券回购利率

C.同业拆借利率

D.公司债券利率