已知某汉字的区位码是3222，则其国标码是A．4252D B．5242H C．403

DNA复制和转录的共同点是[ ]

A．都需要解旋酶破坏氢键

B．在细胞核内进行

C．碱基互补配对原则完全相同

D．不需要ATP提供能量

用黑盒技术设计测试用例的方法之一为( )。

A．因果图

B．逻辑覆盖

C．循环覆盖

D．基本路径测试

阅读理解。

     Are you sometimes a little tired and sleepy in the early afternoon? Many people feel this way after lunch.

They may think that eating lunch is the cause of the sleepiness. Or, in summer, they may think it is the heat.

However, the real reason lies inside their bodies. At that time-about eight hours after you wake up-your body

temperature goes down. This is what makes you slow down and feel sleepy. Scientists have tested sleep habits

in experiments where there was no night or day. The people in these experiments almost always followed a

similar sleeping pattern. They slept for one long period and then for one short period about eight hours later.

     In many parts of the world, people take naps (小睡) in the middle of the day. This is especially true in

warmer climates (气候), where the heat makes work difficult in the early afternoon. Researchers are now

saying that naps are good for everyone in any climate. A daily nap gives one a more rested body and mind

and therefore is good for health in general. In countries where naps are traditional (传统的), people often

suffer less from problem such as heart disease.

     Many working people, unfortunately, have no time to take naps. Though doctors may advise taking naps,

employers do not allow it! If you do have the chance, however, here are a few tips about making the most

of your nap. Remember that the best time to take a nap is about eight hours after you get up. A short sleep

too late in the day may only make you feel more tired and sleepy afterward. This can slao happen if you sleep

for too long. If you do not have enough time, try a short nap-even ten minutes of sleep can be helpful.

1. Why do people feel sleepy in the early afternoon according to the text?

A. They eat too much for lunch.

B. They sleep too little at night.

C. Their body temperature becomes lower.

D. The weather becomes a lot warmer.

2. If you get up at 6:30 am, what is the best time for you to take a nap?

A. About 12:30 pm

B. About 1:30 pm

C. About 2:30 pm

D. About 3:30 pm

3. What would be the best title for the text?

A. Just for a Rest

B. All for a Nap

C. A Special Sleep Pattern.

D. Taking Naps in Warmer Climate.

电感线圈的主要物理特性中，（）的说法是错误的。

A.电感线圈能储存磁场能量

B.电感线圈能储存电场能量

C.电感线圈中的电流不能突变

D.电感在直流电路中相当于短路，在交流电路中，电感将产生自感电动势，阻碍电流的变化

Coreldraw中绘制的图形是（）的。

A、矢量

B、位图

C、像素

D、混合