读一读，写一写。 二人→（从） 三人→（ ） 又寸→（ ） 二木→（ ）　三木→（

恒温恒压下，在容积可变的器皿中，反应2NO₂(g)N₂O₄(g)达到平衡后，再向容器内通入一定量的

NO₂，又达到平衡时，N₂O₄的体积分数[ ]

A．不变　　

B．增大　　

C．减小　　

D．无法判断

大量风险的集合，一方面是基于（）的技术要求，另一方面是概率论和大数法则原理在保险经营中得以运用的前提。

A.风险集中

B.风险规避

C.风险损失

D.风险分散

设有商店和顾客两个实体，“商店”的属性有商店编号、商店名、地址、电话，“顾客”的属性有顾客编号、姓名、地址、年龄、性别。假设一个商店有多个顾客购物，一个顾客可以到多个商店购物，顾客每次去商店购物有一个消费金额和日期，而且规定每一个顾客在每一个商店里最多消费一次。试画出E—R图，并注明属性和联系类型。

E

Last year, Shanghai-born Charles K. Kao and two North American scientists got the 2009 Nobel Prize(诺贝尔奖) in Physics together. Their work made the Internet come into a new age.
Kao, 77, was born in Shanghai in 1933. He is famous for finding out how to transmit (传输)light signals(信号) over long ways through glass fibers (玻璃纤维) as thin as a human hair. His work makes the Internet information transmit faster around the world. Kao was vice chancellor(副校长) of the Chinese University of Hong Kong from 1987 to 1996. He doesn’t work, and lives in Hong Kong now.
The Chinese people were pleased to learn the good news. "The people of Hong Kong and I send our congratulations to Kao on receiving the prize... Kao is also a true gentleman. We are greatly proud to have such an excellent person in Hong Kong. "Zeng Yinquan once said.
Willard Boyle, a Canadian American, and George Smith of the United States got the other half of the prize.

Which of the following is Not true ( )

A．Kao’s work makes the Internet information transmit faster around the world.

B．Kao is still working in the Chinese University of Hong Kong now.

C．Willard Boyle and George Smith are both scientists.

D．Kao is died now.

Exce1中，若A1：A4中单元格区域的值是“1，2，3，4”，单元格B1的公式“=max（A1：A4）”，则B1单元格的值是（）。

A.4

B.3

C.2

D.1