抗渗性

Our world is full of rules. Everyone needs to obey them. But      your idea about your school rules? Now many students like to talk about the rules that they have      . At their school, they      wear uniforms every day. The problem is that all the students think the uniforms are        . They think young people should look smart and so they would like to wear their own clothes.      , their teachers believe that if they did that, they would think       of their clothes than their study.       the students disagree. They would feel more comfortable and that is good for      . If they can’t do that, they        design their own uniforms. That would be a good way to      both teachers and students happy.

It’s also probably a good idea for parents to allow teenagers to study in groups during the evening.  Although they get        sometimes, they can learn a lot from each other. They also think that vacations should be longer. At present they’re too      . Longer vacations would give them time to do things like volunteering. On Friday afternoons, many students are sleepy after a long week of classes. They think it’s better to have Friday afternoons        to volunteer and help others.        , it is helpful for students to go to an old people’s home to sing and perform a play for them. It will help them understand the meaning of love. It’s also better to volunteer at the local hospital. It would be a good         for them because some of them want to be doctors when they grow up.

What do you think of your school rules?

小题1:

A．how’s

B．what’s

C．how’re

D．what’re小题2:

A．at home

B．in hospital

C．after class

D．in school小题3:

A．have to

B．may

C．can’t

D．mustn’t小题4:

A．comfortable

B．smart

C．ugly

D．nice小题5:

A．Although

B．However

C．Yet

D．Still小题6:

A．much

B．more

C．little

D．less小题7:

A．And

B．So

C．Or

D．But小题8:

A．studying

B．studies

C．health

D．healthy小题9:

A．should be allowed to

B．aren’t able to

C．aren’t allowed to

D．will have to小题10:

A．keeping

B．be

C．keep

D．being小题11:

A．quietly

B．quickly

C．happily

D．noisy小题12:

A．shorter

B．longer

C．long

D．short小题13:

A．off

B．of

C．on

D．down小题14:

A．For example

B．By the way

C．To be honest

D．Such as小题15:

A．teacher

B．experience

C．doctor

D．rule

The boy cheated in the English examination so he deserved ________.

A．being punished

B．to be punished

C．to punish

D．having punished

如图所示，电源电动势为E=100V，内阻不计，R₁、R₂、R₄的阻值均为300Ω，R₃为可变电阻．C为一水平放置的平行板电容器，虚线到两极板距离相等且通过竖直放置的荧光屏中心，极板长为L=8cm，板间距离为d=1cm，右端到荧光屏距离为s=20cm，荧光屏直径为D=5cm．有一细电子束沿图中虚线以E₀=9.6×10²eV的动能连续不断地向右射入平行板电容器．已知电子电量e=1.6×10¹⁹C．要使电子都能打在荧光屏上，变阻器R₃的取值范围多大？

患者50岁，男，右侧胸痛、咳嗽、咯血3个月，结合胸片和CT检查，最可能的诊断是（）

A.纵隔肿瘤

B.肺结核

C.肺癌

D.胸膜间皮瘤

E.韦格肉芽肿

分子筛入口的空气温度升高，则分子筛的周期吸附容量（）。

A、不变

B、降低

C、升高