患者，男，37岁，诉右上后牙自发性钝痛1个月，1天前疼痛加重，较剧烈，出现夜间痛，冷

阅读理解。

      Mobile phones (手机) have become a problem for middle schools. Some middle

schools in Australia have banned (禁止) students from carrying mobile phones during

school hours.

      Mobile phones' 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 Bluett, an official, said mobile phones' 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 said 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, but if there was

a good reason, they could leave their phones at the school office. They also said there were

many reasons why the students should not 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

mobile phones, but they think schools should let the students know when they can use

their mobile phones.

1. Some middle schools in Australia have banned 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. We know from the passage that some children get mobile phones from _____. [     ]

A. the makers and sellers

B. the passers-by and strangers

C. their parents and friends

D. some mobile phone users

3. What does the underlined word "cheat" mean in Paragraph 3?[ ]

A. 聊天

B. 核对

C. 查询

D. 作弊

4. Some parents felt unhappy because they couldn't _____ during school hours.[ ]

A. use their mobile phones

B. leave their mobile phones at 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 except for some special reasons

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

C. some parents felt unhappy because their children couldn't use mobile phones at school

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

充抵保证金的有价证券，在计算保证金金额时应当以证券市值按规定的折算率进行折算，其中，交易所交易型开放式指数基金折算率最高不超过( )。

A．70%

B．80%

C．90%

D．100%

嗜铬细胞瘤患者出现阵发性高血压的表现为（）

A.平时血压正常

B.发作时血压逐渐上升

C.发作终止后可出现迷走神经兴奋症状

D.可发展为持续性高血压

E.吸烟不会诱发高血压

下列监测方法中属于肾上腺髓质功能监测的是

A．促肾上腺皮质激素(ACTH)兴奋试验

B．小剂量地塞米松抑制实验

C．冷加压实验

D．高渗盐水试验

E．以上都是

影响蛋白质消化吸收的因素。