电流是用单位时间内通过导体横截面积的（）来量度。A、电能 B、电功 C、电荷量 D、

Hi Hongbo,

I’m so glad to read about the changes talking place in your city. It’s really good news that you can travel by subway in Xi’an, though there’s only one line there. Here in London we have twelve lines. By the way, we don’t use the word “subway” here. It’s American English. We call it “the Underground”, instead.

The London Underground is very famous. It’s famous for several reasons. First of all, part of the underground railway today is the oldest in the world, which opened in 1863. Secondly, the London Underground is also the first line to have electric trains, in 1890. Thirdly but not the last, the London Underground is the second largest metro system in the world, after the Shanghai Metro. There are 270 stations in the Underground and it has 402 kilometres of tracks(轨道). What’s more, the city of London itself helps make the transportation system famous! I’ve got a few photos to help you build a clear picture of the Underground in my city. They are together with this mail.

In your email, you also said workers were building more lines. I’m sure your city is developing fast. Maybe you can send me a few photos of your city today. I really want to see the changes taking place there. I’m happy for you to live there in an ancient city with such a new look!

So much for now. I’ll write soon again. Best wishes!

小题1:Where is the writer from？

A．From London

B．From Shanghai

C．From Xi’an.

D．From New York小题2:The second paragraph mainly tells us        ?

A．when the first subway was opened in the world.

B．when the London Underground first used electric trains

C．why the London Underground is the oldest subway in the world.

D．why the London Underground is famous in the world小题3:In the email, the words “subway”, “underground”, and “metro” mean   .

A．three different things

B．two different things

C．almost the same thing

D．nothing like each other小题4:What does the writer want Hongbo to do?

A．To buy a good book about Xi’an for him.

B．To send him a few photos of Xi’an.

C．To post him some postcards of Xi’an.

D．To tell him more about Xi’an subway.

心材由于生长年久，故坚硬，比边材好。( )

以下关于卖方押汇利息收取和计息天数正确的是（）

A.可以采取预扣方式

B.可以采取后收利息方式

C.即期信用证押汇计息天数＝合理邮程天数＋银行合理工作日+5个工作日

D.延期付款信用证押汇计息天数＝押汇起息日至付款到期日天数＋5个工作日

回答下列问题：

清晨静脉取血测定正常人和胰岛B细胞分泌功能不足者的空腹血糖浓度。空腹时，血糖的来源是（）和（）。

转向装置故障主要发生在转向器和转向传动机构上。