喜树碱 A．有机胺类 B．吡啶(pyridine)衍生物 C．莨菪烷(tr

一个开关同时控制电灯发光和电铃发声，则这两个用电器

A．一定是串联接入电路中　

B．一定是并联接入电路中

C．可能串联也可能并联接入电路中

D．以上说法都不正确

阅读理解。

     I'm seventeen. I had worked as a box boy at a supermarket in Los Angeles. People came to the counter

and you put things in their bags for them. And carried things to their cars. It was hard work.

     While working, you wear a plate with your name on it. I once met someone I knew years ago. I

remembered his name and said, "Mr. Castle, how are you?" We talked about this and that. As he left, he said,

"It was nice talking to you, Brett." I felt great, he remembered me. Then I looked down at my name plate.

Oh no. He didn't remember me at all, he just read the name plate. I wish I had put "Irving" down on my name

plate. If he'd have said, "Oh yes, Irving, how could I forget you?" I'd have been ready for him. There's nothing

personal here.

     The manager and everyone else who were a step above the box boys often shouted orders. One of these

was:you couldn't accept tips (小费). Okay, I'm outside and I put the bags in the car. For a lot of people, the

natural reaction (反应) is to take a quarter and give it me. I'd say, "I'm sorry, I can't." They'd get angry. When

you give someone a tip, you're sort of being polite. You take a quarter and you put it in their hand and you

expect them to say, "Oh, thanks a lot." When you say, "I'm sorry, I can't." they feel a little put down. They say,

"No one will know." And they put it in your pocket. You say, "I really can't." It gets to a point where you almost

have to hurt a person physically (身体上) to prevent him from tipping you. It was not in agreement with the

store's belief in being friendly. Accepting tips was a friendly thing and made the customer feel good. I just could

n't understand the strangeness of some people's ideas. One lady actually put it in my pocket, got in the car, and

drove away. I would have had to throw the quarter at her or eaten it or something.

     I had decided that one year was enough. Some people needed the job to stay alive and fed. I guess I had the

means and could afford to hate it and give it up.

1. What can be the best title for this text?

A. How Hard Life is for Box Boys

B. Getting along with Customers

C. Why I Gave up My Job

D. The Art of Taking Tips

2. From the second paragraph, we can infer that _____.

A. the writer didn't like the impersonal part of his job

B. with a name plate, people can easily start talking

C. Mr. Castle mistook Irving for Brett

D. Irving was the writer's real name

3. The box boy refused to accept tips because _____.

A. customers only gave small tips

B. some customers had strange ideas about tipping

C. the store didn't allow the box boys to take tips

D. he didn't want to fight with the customers

4. The underlined phrase "put down"in the third paragraph probably means _____.

A. misunderstood

B. defeated

C. hateful

D. hurt

施主天线接受的基站下行载波信号首先经过：（）

A．中频信号放大

B．上下变频器变频

C．合路器合路

D．低噪声放大器处理

自有固定资产和租入固定资产是按照固定资产的所有权来分类的，租入固定资产的所有权仍属于出租单位，但企业拥有其使用权和实质性的控制权。( )

管道常用的脱脂剂为（）、（）。