问题 选择题

下列有关指定容器中水的主要作用的说法,错误的是(  )

实验

装置

硫在氧气中燃烧

测定空气中氧气含量

铁丝在氧气中燃烧

探究燃烧的条件

主要作用集气瓶中的水:

吸收反应放出的热量

量筒中的水:

通过水体积的变化得出空气中O2体积分数

集气瓶中的水:

冷却溅落的熔融物,防止集气瓶炸裂

烧杯中的水:

加热铜片温度,

隔绝空气

选项ABCD

A.A

B.B

C.C

D.D

答案

答案:A

阅读理解

Do you want to have a mobile phone? Have you had a mobile phone already? Nowadays more and more students have their own mobile phones, and mobile phone use has become a problem for middle schools. Some middle schools in China have banned students from carrying mobile phones during school hours.

Mobile phone use among children has become a big problem for the school this year. Some children have got mobile phones as birthday gifts, and more students want them.

Wang Pi, an official, said, “Mobile phone use is a distraction (分散注意力的东西) 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.

Wang Pialso said some schools had tried to ban mobile phones, but 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 their was a good reason, they could leave their phones at school offices. 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 phones, but they think schools should let the students know when they can use their mobile phones.

小题1:Some middle schools have banned students from carrying mobile phones         .

A.because they are students

B.because they don’t earn money

C.when they are at school

D.when they are free小题2:Some parents felt unhappy because they couldn’t        during school hours.

A.help the teachers with their work

B.leave their mobile phones at school offices

C.use their mobile phones

D.get in touch with their children小题3:The three underlined words “they” in Para. 5 refer to       .

A.teachers; students; mobile phones

B.teachers; mobile phones; students

C.students; teachers; mobile phones

D.students; mobile phones; teachers小题4:The passage tells us that         .

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

B.some parents felt unhappy because they couldn’t use their phones at school

C.students shouldn’t have mobile phones at school except for some special reasons

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

单项选择题