已知某氯化钠样品中含有另一种氯化物，经测定该混合物中氯元素的含量为56．2％，则

Jeffrey Bezos, founder, president and chairman of the board of Amazon.com, was born in Albuquerque, New Mexico. His mother’s ancestors were early settlers in Texas, and over the generations had acquired a 25,000 acre farm at Cotulla. Jeffrey spent most summers of his youth working with his grandfather on their farm.

Jeffrey showed intense and varied scientific interests at an early age. He set up an electric alarm to keep his younger sisters and brothers out of his room and changed his parents’ garage into a laboratory for his science projects.

After he graduated from Princeton University with a degree in computer science and electrical engineering, Jeffrey Bezos found employment on Wall Street, where computer science was increasingly in demand to study market trends. He rose quickly, becoming a senior vice president, and looked forward to a bright career in finance, when he made a discovery that changed his life, and the course of business history.

In 1994, there was still no internet commerce to speak of. One day that spring, Jeffrey Bezos observed that Internet usage was increasing by 2300 percent a year. He saw an opportunity for a new circle of commerce, and immediately began considering the possibilities.

Bezos founded Amazon.com in 1994, setting up the original company in his garage. The company was called Amazon for the seemingly endless South American river with its numberless branches. It started as an online bookstore but soon diversified to all kinds of products. His work with Amazon eventually led him to become one of the most excellent dot-com entrepreneurs. He was named Time magazine’s Person of the Year in 1999. In 2008, he was selected by U.S. News & World Report as one of America’s Best Leaders. Bezos’ Amazon has become “the Earth’s biggest anything store”. Amazon.com is now called “one of the smartest strategies in business history”.

Today, Jeffrey Bezos lives north of Seattle and is increasingly concerned with charity activities. “Giving away money takes as much attention as building a successful company,” he said.

小题1: In his childhood, Bezos ______.

A．had to work with his grandfather on their farm all day long

B．showed great interest in science

C．didn’t get along well with his brothers and sisters

D．wanted to become a businessman小题2:Jeffrey changed the course of business history because he ______.

A．looked forward to a bright career in finance on Wall Street

B．considered the possibility of setting up an original company

C．founded a new form of commerce that developed fast later

D．was the first to speak of Internet commerce小题3:Which of the following isn’t mentioned in the passage?

A．How hard Bezos studied in Princeton University.

B．“Amazon.com” only sold books in the beginning.

C．Bezos not only devoted his life to Internet commerce but also to charity.

D．The reason why Jeffrey Bezos decided to found Amazon.com.小题4: It can be inferred from the passage that ______.

A．it was Bezos’s grandfather on the farm who helped him a lot

B．Bezos invented e-commerce to win the world fame overnight

C．Bezos has a sharp business mind and a kind heart

D．Bezos aimed at setting up “the Earth’s biggest bookstore”

以下是有关PC机键盘的叙述，其中错误的是

A．目前台式PC机键盘大多采用PS/2或USB接口

B．PC机键盘不能以一键一字的方式输入所有汉字

C．PC机键盘向主机输入的是所按键的ASCII码

D．PC机键盘接口以串行方式向主机传送按键信息

目前中国人民银行公开市场业务的交易方式主要有( )。

A．中央银行票据

B．价格招标

C．定期现券买断

D．数量招标

E．定期现券卖断

无功功率不足是造成用户电压偏底的原因之一。（）

UWB技术主要应用在以下哪些方面（）

A.无绳电话

B.地质勘探

C.家电设备及便携设备之间的无线数据通信

D.汽车防冲撞传感器