2009年5月1日的英文怎么写?

Dear Prof.Herthwell,
Many thanks for your kind hospitality and the honor you showed me during our delegation’s recent visit to your university.It was nice of you to introduce me to so many of your famous professors and celebrated scholars at your university.We had a safe and sound trip home.Now we have resumed our work.
Meanwhile,I hope you will someday pay a short visit to our university and give us some lectures on “Modern Western Economics”.
Please have no hesitation in writing to me if you want me to do something for you in China.
With best wishes.
Sincerely yours,
Li Dong

1、B 2、D

I would like to be a volunteer in my spare time. My reasons are as follows:
First of all, it is a good virtue to help others, even in modern society. We all need others’ help in case we get into trouble. Secondly, we are able to better ourselves by helping others because we gain valuable experience and build up our confidence while serving others. What’s more, volunteering makes us feel better about ourselves, thus making our life more enjoyable. More importantly, we can make the world a better place to live in by volunteering to improve it.
In summary, volunteering can make a difference to our life, so I think it is very rewarding to be a volunteer.

略

解题思路：科学记数法的表示形式为a×10ⁿ的形式，其中1≤|a|＜10，n为整数．确定n的值时，要看把原数变成a时，小数点移动了多少位，n的绝对值与小数点移动的位数相同．当原数绝对值大于1时，n是正数；当原数的绝对值小于1时，n是负数．

612 251=6.12251×10⁵．
故选B．

点评：
本题考点： 科学记数法—表示较大的数．

考点点评： 把一个数M记成a×10n（1≤|a|＜10，n为整数）的形式，这种记数的方法叫做科学记数法．规律：
（1）当|a|≥1时，n的值为a的整数位数减1；
（2）当|a|＜1时，n的值是第一个不是0的数字前0的个数，包括整数位上的0．

答案：D

因为是先进先出法 发出材料400千克 所以库存还剩下100千克 实际成本为330元的甲材料

2009年5月1日是星期5

365*4+1-31-30-31-31-10=1339

查查万年历就知道了

本息=30000+30000×3.69%×3=33321元

税后利息＝本金×利率×期限×（1-税率）
税后利息＝2000×2.25%×1×（1-5%）=42.75元
本息和＝2000+42.75＝2042.75元

C

May 1st 2009 sunny
Today is national labor's day,a major holiday in China.I took a bus to Donghu Park with several friends.We had a picnic under a tree at noon and appreciate the view不能打了）

1000+1000×2.79%×2，
故选：D．