阅读理解

　　High school students in America hear about twenty bells every day. The first bell is the tardy bell(上课铃). If students are not in their seats when the tardy bell rings, they know they are late. Another bell rings at the end of each class, and everyone leaves class quickly and goes to the next one. When students are in a difficult class, they are often happy to hear the bell; but if the class is interesting, they do not want the bell to ring. Most students like the lunch bell best. They know it is time to join their friends for lunch. They buy a hot meal in the school dining-room or they bring their lunch from home in a big paper bag.

　　After a nice lunch, everyone knows it is soon time for another bell, another bell….

1．American students in high schools hear ________ bells every day.

[　　]

2．The students are happy to have ________.

[　　]

3．Most students like the lunch bell best because ________.

[　　]

A．they don't like their classes

B．they can have a lot to eat

C．they can join their friends for lunch

D．they can open their big paper bags

完形填空

　High school students in America hear about twenty bells 　1　 . The first bell is the tardy bell (上课铃). If students are not in their seats when the tardy bell　　 　2　　 　, they know they are late. 　3　　 　bell rings at the end of 　4　　 　class, and everyone　　 　5　　 　class quickly and goes to 　6 　. When students are in 　7　　 　class, they are often happy to hear the bell ring;but if the class is interesting; they do not want the bell 　8 　. Most students like the lunch bell best. They know that it is time 　9　　 　their friends for lunch. They buy a hot meal in the school dining-room or they bring their lunch from home in a big paper bag.

　After a nice lunch everybody knows　　 　10 　it is soon time for another bell, another bell, another bell...