理想电压源和理想电流源可以等效互换。

目前中药系统杀虫，防霉采用的气调养护方法是（）。

A.充N2降O2或充CO2降O2

B.用换气扇换气

C.充氧气

D.控制温度

下图所示的生产模式最可能适用的地区及其优点是

A．东北森林地区；利于林区经济发展

B．西北沙漠地区；利于生态环境改善

C．江南丘陵地区；利于循环经济发展

D．青藏高原地区；利于充分利用太阳能

牙菌斑中结构疏松，又被称为外层的是（）

A．基底层

B．中间层

C．表层

D．浅层

E．深层

They crossed in front of me as I was driving out of the store parking lot．My first reaction was filled with anger at being delayed for a whole ten seconds．But I quickly became patient when I realized that this was an elderly couple．

The man leaned on his wife who walked in front of him．He not only used her for support but it was obvious that he was blind．The two of them worked as one—each needing the other to function in this fast-changing world．

That little example of true strength changed my whole personal perception(理解)of life that day．Suddenly I wasn’t so mad about having to work a few extra hours on Saturdays．I had my strength，and I was still relatively young．

That picture of those two elderly people walking with dignity and strength stayed with me the entire week．My life wasn’t so bad after all．I had my health and a good job．I had a wonderful，supportive wife．I started to think—not only was I lucky to have these all, but also was that wonderful old couple，who，despite the trials and sufferings of a long life，still had the love and support of each other to carry them through this world．

There are so many people out there just like that couple．My wife and I sometimes picture ourselves in our old age, walking arm in arm into the sunset．That image always gives us a warm feeling of comfort．Just remember，none of us would be here if it wasn’t for our elders．We all should spend a little extra time and patience when it comes to helping our elder friends．

小题1:When the author was about to drive away，the couple        ．

A．entered the store

B．hit his car

C．got in his way

D．asked him for help小题2:What did the author think of the couple?

A．They lived a happier life than he

B．They were admirable for their lasting love

C．They didn’t live a life without hardships

D．They wouldn’t be respected for walking together．小题3:From the passage，we learn          

A．the author hated working on Sundays

B．the author is satisfied with his life

C．old couples were advised to walk in the sunset

D．many people like that couple because they are blind小题4:What would be the best title for this passage?

A．Spend an Extra Minute

B．Stay with Your Wife

C．Be Careful When Driving

D．Respect the Blind，Please

在国际货物买卖中，卖方根据买方提供的样品，加工出一个类似的样品交给买方确认，并将确认的样品作为最后交货的质量依据，这种样品为( )。

A．确认样品

B．复样

C．买方样品

D．卖方样品