The mobile phone has become a problem for high schools. Some high-school students in Australia are not allowed to carry mobile phones during school hours.
The mobile phone used among children has become a problem for the school years. Several children have got mobile phones as Christmas presents, and more students want them. Marry Brown, a headmaster, said that the mobile phone was a distraction (分心事) to students during school hours and it also gave teachers so much trouble in their classrooms. Teachers also say that sometimes students might use phone messages to cheat during exams.
She said some schools had tried to ban mobile phones. Some parents felt unhappy because they couldn't get in touch with their children.
Many teachers said students should not have mobile phones at school, if there was a good reason, they could leave their phones at school office. They also said phones were easily lost and were a distraction for studies.
Many people say that they understand why parents would want their children to have phones, but they think schools should let students know when they can use their mobile phones.
Some high schools in Australia have stopped students from carrying mobile phones ____

A．because they are students	B．when they are free
C．when they are at school	D．because they are children

The headmaster, Marry Brown said that the mobile phone was ____to students at school.

A．a bad thing

B．a useful tool

C．a good thing

D．of some help

Some parents felt unhappy, because they couldn't__________ during school hours.

A．use their mobile phones	B．leave their mobile phones in the school office
C．help the teachers with their work	D．get in touch with their children

The passage tells us that________

A．students shouldn't have mobile phones at school except for some special reasons

B．it is important to ban students from using mobile phones at school

C．some parents felt unhappy because they couldn't use their phones at home

D．parents should teach their children how to use mobile phones during school hour