生物碱类抗肿瘤药物是()A．长春新碱 B．羟基脲 C．更生霉素 D．阿糖胞苷 E．塞

用N_A表示阿伏加德罗常数的值．下列叙述正确的是（　　）

A．标准状况下，22.4L 己烷中共价键数目为19N_A

B．由CO₂和O₂组成的混合物中共有N_A个分子，其中的氧原子数为2N_A

C．常温常压下的33.6L 氯气与27g铝充分反应，转移电子数为3N_A

D．1L浓度为1mol•L^-1的Na₂CO₃溶液中含有N_A个CO₃^2-

尿浊的临床特征有（）

A.小便混浊

B.尿白如泔浆

C.排尿时无疼痛

D. * * 热痛

E.尿量多不正常

阅读理解。

     Amie Carton was only 18 months old when she had the accident that scarred (留下创伤) her for life.

The curious child reached up to get the wire of a hot kettle in the kitchen and poured boiling water over

her body.

     Her mother Ruby called an ambulance which rushed her to a nearby hospital. Twenty percent of Amie' s body had been burned and all of her bums were third-degree. There, using tissue taken from unburned

areas of Amie' s body, doctors performed complex skin grafts (移植) to close her wounds and control

her injuries, an operation that took about six hours. Over the next 16 years, Amie had 12 more operations to repair her body.

     When she started school at age 4 , other pupils made cruel comments or simply wouldn't play with

her." I was the only burned child in the street," she recalled, " some children refused to become friends

because of that."

     Today, age 17, Amie can only ever remember being a burned person with scars; pain is a permanent

part of her body. She still has to have two further skin grafts. Yet she is a confident, outgoing teenager

who offers inspiration and hope to other young bums victims. She is a member of the Scottish Burned

Children's Club, a charity set up last year. This month, Amie will be joining the younger children at the

Graff ham Water Center for the charity' s first summer camp. "I'll show them how to treat others' unkind

stares as unimportant and not worry about them," she says. Amie loves wearing fashionable sleeveless

tops, and she plans to show the younger children at the summer camp that they can too." I do not go to

great lengths to hide my burns scars," she says, "I gave up wondering how other people would react

years ago."

1.When Amie first went to school, other children ______.

A. took interest in her injuries          

B. hoped to be her friends

C. were cruel to her                

D. were afraid of her

2.Why does Amie join younger children at the Graffham Water Center?

A. To face others' unkindness bravely.    

B. To live a normal life.

C. To show her fashionable sleeveless tops.

D. To recover from injuries.

3. What does the writer think of Amie?

A. Generous.  

B. Powerful.      

C. Optimistic.

D. Fashionable.

目前购买股票和债券已成为我国居民经济生活中的普遍现象。某人从银行购买了5万元的政府债券，与股票相比债券（）

A、从性质上看，它是股份凭证

B、从风险上看，它的安全性更小

C、从发行上看，它的主体是银行

D、从偿还上看，它可以还本付息

层次模型和网状模型统称为 【13】 模型。