老年人出现哪种情况时，麻醉前用药以东莨菪碱替代阿托品()A．心动过缓 B．限制性通气

阅读短文，选择正确答案。

      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.

      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 will want them. Marry Brown, a headmaster, said that

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 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 there was a good reason that they

could leave their phones at school offices. They also said they 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 the students know when they can use their mobile phones.

1. 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

2. What does the word "cheat" mean in Chinese in this passage? [ ]

A. 聊天

B. 核对

C. 查询

D. 作弊

3. Some children get mobile phones from _____ as presents. [ ]

A. the makers and sellers

B. the teachers and strangers

C. their parents and friends

D. some mobile phone users

4. 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

5. The passage tells us that _____. [ ]

A. students shouldn't have mobile phones at school

B. it is good to allow students to use 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 hours

可以连接数据源中“OLE”类型的字段的是( )。

A．非绑定对象框

B．绑定对象框

C．文本框

D．组合框

声测管及耦合水的声时修正值计算公式是什么？

矿井必须从采掘生产管理上采取措施，防止瓦斯积聚。

简述临终护理的概念及目的。