在网络地址178.15.0.0中划分出10个大小相同的子网，每个子网最多有___(
题型：单项选择题
问题：
在网络地址178.15.0.0中划分出10个大小相同的子网，每个子网最多有___( )___个可用的主机地址。
A．2046
B．2048
C．4094
D．4096
题型：单项选择题
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(图表) 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出席)
Diagram (3): Different programs people like.
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:How many people go to the library on Saturdays?
A．About 20%.
B．About 40%.
C．Over 60%.
D．More than 80%.小题3:The three diagrams show us the results of a survey about .
A．what people do every day
B．people’s different habits
C．people’s different lifestyles
D．how people spend their free time