关于电功和电功率，下列说法中正确的是（ ） A．电流通过导体时做功越多，则电功率

斜率鉴频器中使用LC并联谐振回路的目的是( )

A．选频

B．阻抗变换

C．进行频率—幅度变换

D．进行频率—相位变换

阅读下面的短文，然后按照要求写一篇150词左右的英语短文。

I once met a middle-aged stranger who said his money had been stolen at the railway station，so he had no money to go home． He begged for help from passers-by，but they all pretended not to have heard what he was saying and went by quickly． Then he stopped me and wanted me to give him the help． At first I could not accept that because I didn't think he was telling the truth． But when I saw tears in his eyes，I began to believe that he might be in the real trouble，so，just immediately I gave him all the money I had． When he took the money， his face turned red． Before he left，he expressed his great thanks and also said he would give back my money when he reached home．

When I came back to school and told my classmates about my story，they held different opinions． Some of them thought that I did a good deed to have given a hand to the person in trouble，while others said that I was cheated． Some even laughed at me and called me a fool who could not judge things in the right way． Now，I am really confused！

【写作内容】

1．请用30个词概括短文的要点；

2．以约120个词就"陌生人可不可信"的主题发表看法，并包括如下要点：

（1）叙述你给予陌生人帮助或拒绝帮助陌生人的一次真实或虚构的经历；  

（2）说明你的理由。

【写作要求】

1．可以使用实例或其它论述方法支持你的论点，也可以参照阅读材料的内容，但不得直接引用原文中的句子； 

2．标题自定。

下列文件中，确立了英国君主立宪政体的是  [ ]

A．《权利法案》

B．《独立宣言》

C．《 * * 宣言》

D．《1787年宪法》

余额为100元以上的普通储值票退票时，需在（）个工作日后到退票车站领取退款。

A.5

B.6

C.7

D.8

在下滑道刻度上，1个点代表多少度的偏离（）

A.±0.4°

B.±0.6°

C.±0.8°