根据短文内容，从每小题A、B、C三个选项中选出一个最佳答案。
Mobile phone use among children has become a problem for the school this year. Several children have got mobile phones as Christmas gifts, and more students will want them.
Mary Bluentt, an official, said mobile phone use is a distraction（分心的事）to students during school hours and it also gives teachers so much trouble in their classrooms. Teachers were also saying that sometimes students might use phone messages to cheat during exams.
She said some schools had tried to ban（禁止）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, but if there were special or good reasons（理由）, they could leave their phones at school office. They also said there were many reasons why the students shouldn't have mobile phones at school: they were easy to lose and were a distraction from studies.
Many people say that they understand why parents would want their children to have phones, but they think schools should let the students know when they can use their mobile phones.
Some middle schools in Australia have stopped students from carrying mobile phones            .
A. because they are students
B. because they are children
C. when they are at school
We know from the passage that some children get mobile phones from             .
A. some mobile phone users
B. their parents and friends
C. the makers and sellers
The underlined word "cheat" means           in this passage.
A. 查询       B.作弊      C.聊天
Some parents felt unhappy because they couldn't           during school hours.
A. get in touch with their children
B. help the teachers with their work
C. leave their mobile phones at school office
The passage tells us that students shouldn't have mobile phones at school except for         .
A. special or good reasons
B. their parents feel unhappy
C. listening music

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