甲、乙两数的比是5∶3，差是18，它们的和是（ ）。

书面表达。

Dear Peter,

     Thanks for your last letter. I am happy to know you' had a very great funny vacation. As your best

pen pal, I'd like to tell you how I spent my vacation. I didn't go to school on May 1st and my parents

didn't go to work, so we went to visit Changbaishan. There are many buses to go there. We had a new

car and my mother drove the car there. Changbaishan is really an interesting place. Many people go

there every day. We saw lots of beautiful trees and had lunch under a tall tree. Then we went to Tian

Chi—a fantastic big lake (湖泊)—The water is blue and very clean. But nobody can swim in the water.

It can make it dirty and it is dangerous to swim in it. We took many photos with our camera. At 5: 00

p.m. we went home happily.

                                                                                                                                    Yours,

                                                                                                                                 Wang Qiang

1. Peter and Wang Qiang are ______.     

A. classmates 

B. cousins

C. brothers

D. pen pals

2. When did they go to Changbaishan? 

A. On May 4th.

B. On June l st.

C. On May 1st. 

D. On July 1st.

3. Wang Qiang and his parents ______ to Changbaishan.     

A. took a taxi    

B. took a car

C. took a bus 

D. walked

4. What does the word "drove" mean?     

A. 购买        

B. 推销

C. 讨论             

D. 驾驶

5. Wang Qiang and his parents didn't ______ on Changbaishan. 

A. swim Tian Chi  

B. have lunch

C. see any trees

D. take photos

关于如图所示的粒子结构示意图的说法中，不正确的是

①      ②

A．①、②的核外电子数相同

B．②属金属元素

C．①、②都有相对稳定的结构

D．①是阴离子

女性，36岁，主诉头晕、乏力、3年来月经量多，浅表淋巴结及肝、脾无肿大，血红蛋白58g／L，白细胞8．0×10⁹／L，血小板185×10⁹／L，血片可见红细胞中心淡染区扩大，网织红细胞计数0．005。

对上述治疗效果反应最早的指标是（）

A.血红蛋白升高

B.白细胞数量上升

C.网织红细胞计数

D.叶酸、维生素B₁₂含量升高

E.铁蛋白含量升高

下岗失业人员李建国于2010年11月1日领取了《税务登记证》（颁证日期同），按规定他将享受相关的税费减免的优惠待遇，其享受优惠政策的截止日期应为（）

A.2013年11月1日

B.2012年11月1日

C.2013年12月1日

D.2011年11月1日