消极的课堂气氛通常以紧张拘谨、（）、反应迟钝为特征。

简述二值图像与灰度图像的区别。

自2000年1月1日起，对个人独资企业和合伙企业停止征收企业所得税，其投资者的生产经营所得，比照( )征收个人所得税。

A．工资、薪金所得

B．劳务报酬所得

C．个体工商户的生产、经营所得

D．对企事业单位的承包经营、承租经营所得

Victor’s hobby was collecting stamps. He had stamps from many countries, like England, Canada and China. On his birthday, can you guess what people gave him? That’s right---stamps.

Victor’s favourite stamps came from France. He had almost every stamp from 1954 to 2004. He only needed one. That was a 1974 special edition*. It was very hard to find.

He looked for it everywhere. He asked his friends and relatives to help him. But nobody could find the stamp. It made Victor very sad.

“Don’t worry. Never give up,” his father said to him. “If you have enough patience, you’ll find it one day.”

“I hope so,” Victor said.

Victor also liked writing. He had a penfriend in France. They wrote to each other every month. Victor’s penfriend, Phillip, usually used new stamps to send letters. Sometimes, his mother gave him stamps to use. Once Phillip’s mother gave him a big, green stamp. It looked old. When Victor received the letter, he was very surprised. On the envelope, he looked carefully at the stamp. It was the 1974 special edition stamp. Victor was so happy. He told his sister, his mother and his father.                                                   

“ You see,” his father said. “ You did find your stamp. So, it’s good to have two things in life.”

“What are they?” Victor asked.

“ Friends and patience.” He answered.

小题1:It was very difficult for Victor to find a special French stamp of _________.

A．1954

B．1974

C．1994

D．2004小题2:What does the underlined word “patience” mean?

A．勇气

B．知识

C．耐心

D．目标小题3:Who owned the special edition stamp at the very beginning?

A．Phillip.

B．Phillip’s mother.

C．Victor.

D．Victor’s father.小题4:The passage mainly tells us that ________ is(are) important to people.

A．a happy family

B．a good hobby

C．relatives and friendship

D．friends and patience

稻飞虱在孕穗期和（）发生重。

为了防止意外，驾驶员对汽车任何异常都不能自行处理。