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。
People aged        spend the most time surfing the Internet every week.

A．7—16

B．17—30

C．31—55

D．over 56

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

On weekends,           people go to the library every week.

A．over sixty	B．less than sixty
C．about twenty	D．more than one hundred

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.

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