十进制数25.75转换成十六进制数，其值为____H。

若点P的横坐标与纵坐标互为相反数，则点P一定在（　　）

A．原点

B．第一、三象限两轴夹角的平分线上

C．x轴或者y轴上

D．第二、四象限两轴夹角的平分线上

One year ago. I asked a worker to help me repair my old house. He had a bad first day on the job: his car broke on the way, then he found he had left his tools for work at home and his wife telephoned to say his son had a bad cold. While I drove him home, he was silent all the way. When arriving, he invited me to meet his family.

As we walked towards the front door, he stopped at a small tree, and touched the tree with hands. When we opened the door, I was very surprised to see he changed into another person and there was a big smile on his face instead. He hugged (拥抱) his son and gave his wife a kiss.

After a while, when he walked me to the car, I asked him why he had touched the tree just then. "Oh, that's my trouble tree," he answered.  "Sometimes I have troubles on my job, but one thing is for sure, they don't belong to my wife and my son. So I just hang up (悬挂) the troubles on the tree every night when I come home. Then in the morning I pick them up. "

“The funny thing is," he smiled, "when I come out in the morning to pick them up, I hardly remember what I put the night before. "

根据短文内容，回答下列问题。（10分）

小题1:How was the worker's firs day?

小题2: Where did the worker stop as they walked towards the front door?

小题3: What did the worker call the tree?

小题4: When did the worker pick up the troubles every day?

小题5: Did the worker remember fewer troubles the next morning?

My father is a postman. _____________ bike is green. [ ]

A. He

B. His

C. He's

HIV感染后，导致机体免疫功能受损，下列哪项不是主要机制（）

A.病毒感染对T细胞的直接破坏

B.被感染T细胞被破坏

C.HIV可以感染干细胞

D.HIV使B细胞大量破坏

E.单核-吞噬细胞功能受损

关于发动机滑油的勤务（）

A、停车后即可加油

B、停车后五分钟内

C、停车后等五分钟以后才可以勤务

D、停车后30分钟以后才可以加油