根据短文内容，从每小题所给的三个选项中，选出一个正确答案。

All primary and secondary school students are not 1  to bring mobile phones to school, the Ministry of Education announced in early February, 2021. 

No mobile phones will be able to taken to classrooms, the notice said. Schools should not ask students to do homework on the phones and they should 2  up teacher hot lines（热线） and public phones for communication between parents and students, it added. 

Zhang Ting, the mother of a seventh grader in Beijing, said she strongly 3 the ban（禁令）. "For secondary school students, the knowledge found in books is enough. Nowadays, information is being carried on the Internet, but the content remains the 4 , " Zhang said. "Information online is not 5 than knowledge learned from books. "