多巴胺舒张肾血管是由于 A．抑制单胺氧化酶 B．抑制TXA2生成 C．抑制胆碱酯酶

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     Born on February 9,  1954 in Milwaukee,  Wisconsin, Christopher Gardner never know his father.

He lived with his mother, Bettye Jean Gardner, whom he adored, and, when necessary, in fosterhomes

(寄养家庭). Despite a life of hardship, his mother provided him with strong "spiritual genes" and taught

him some of the greatest lessons of his life, which he follows to this day.

    She convinced him that in spite of where he came from, he could attain whatever goals he set for

himself by saying, "If you want to, one day you could make a million dollars." Gardner believed this to

be fact, and knew he would have to find a career he could be passionate (热情的) about, one that

would allow him to "be worldclass".

    Though he was hardworking and determined, a series of circumstances in the early 1980's left him

homeless in San Francisco and the single guardian of his 2yearold son.  He was unwilling to give up his

son and his dream of financial independence. Though without connections or a college degree, he still

somehow earned a spot in a stockbroker (股票经纪人) training program. Often spending his nights in

a church shelter or the bathroom at a train station in Oakland, Gardner ended up the only trainee offered

a job at Dean Witter Reynolds in 1981.

    Today, he's the CEO of Christopher Gardner International Holdings, a company he founded with

offices in New York, Chicago, and San Francisco. The amazing story of his life was published as an

autobiography, The Pursuit of Happiness, and is the inspiration (灵感,启示) for the movie of the same

name starring Will Smith.

1. The underlined word "one" in the second paragraph refers     to   ________.

   A. the place where he lived

   B. the goal he set for himself

   C. the fact to make a million dollars

   D. his future career

2. From the third paragraph we can learn that ________.

   A. hardworking and determined people can also be defeated by bad luck

   B. Gardner did finish his stockbroker training program

   C. Gardner had to make a choice between his dream and  his beloved son

   D. it is impossible for one without a college degree to get a  job as a stockbroker

3. Gardner's story can be best described as ________.

   A. a ragstoriches story

   B. an orphantomillionaire story

   C. a CEOtostar story

   D. a failuretosuccess story

在没有指定二次雷达编码集的机场管制塔台，必须在航空器起飞前向负责本地区编码分配的（）申请该航空器的二次雷达编码。

A.报告室

B.区域管制室

C.军航

D.地区管理局空管处

逆卡诺循环是在两个不同的热源之间进行的理想制冷循环，此两个热源为下列哪一项？（）

A、温度可任意变化的热源

B、定温热源

C、必须有一个是定温热源

D、温度按一定规律变化的热源

实验研究和调查研究的根本区别为（）

A.是否进行随机抽样

B.是否进行随机分组

C.是否主动对研究对象施加干预措施

D.是否以人为研究对象

E.是否以动物为研究对象

标准溶液通常物质的量浓度和滴定度两种方法表示。（）