（）是分管工作范围内的安全生产第一责任人，对分管范围内的安全生产工作负领导责任，向行

从4名男生和2名女生中任选3人值日，设随机变量ξ表示所选3人中女生的人数．

（Ⅰ）求ξ的分布列、数学期望Eξ；

（Ⅱ）求事件“所选3人中女生至少有1人”的概率．

生命伦理学的含义是（）。

A.根据疗效标准和原则，对生命科学内的人类行为进行系统研究的科学

B.根据医学价值和原则，对医学科学内的有关生命问题进行系统研究的科学

C.根据社会价值和原则，对生命领域内的人类行为进行系统研究的科学

D.根据道德价值和原则，对生命科学和卫生保健领域内的人类行为进行系统研究的科学

E.根据道德价值和原则，对医学科学内的有关生命问题进行系统研究的科学

全口义齿义齿固位力来源不包括（）

A.大气压力

B.摩擦力

C.附着力

D.表面张力

E.内聚力

正常人在平静呼吸时，胸廓容积扩大是由于（　　）

A．肋间内肌收缩，膈肌舒张

B．肋间外肌收缩，膈肌收缩

C．肺容积缩小，气压减小

D．肺容积增大，气压下降

阅读理解

     Canada 4:00 a.m. to 8:00 a.m.

     Canada is a big country with six time zones. In the west, it is four a.m., and everyone is asleep, but in

Halifax on the east coast it is eight o'clock and people are having breakfast. It is a cold Friday morning in November, and the temperature is ten degrees below zero Centigrade.

     Argentina 9:00 a.m.

     In Buenos Aires, the capital of Argentina, it is nine a.m. on a warm summer morning, and people are

starting work or school. November is a summer month in Argentina because it is in the southern

hemisphere(南半球).

     Scotland 12:00 noon

     Scotland is part of the United Kingdom. The capital of Scotland is Edinburgh, and the capital of the UK is London. It is twelve noon, or midday, in Edinburgh. Children are having lessons, but they are looking

forward to the weekend because there is no school on Saturday and Sunday.

     Egypt 2:00 p.m.

     Friday is already the weekend in Egypt. Friday is a special day for Muslims, so schools, offices and

shops are closed in all Arab countries. So now, at two p.m., most people in Egypt are having lunch with

their families.

     Japan 9:00 p.m.

     Japan is seven hours ahead of Egypt, so it is already Friday evening there. The weekend is beginning. Most people are out with friends or watching television or playing computer games.

     New Zealand 12:00 midnight

     It is late on Friday night, so most people are asleep. Now Saturday morning is arriving. It is morning in Canada too, but that is Friday morning!

1. In eastern Canada, the time is _____ that in western Canada.

A. four and a half hours behind      

B. four hours ahead of

C. three hours ahead of            

D. the same as

2. While Canadian children in Halifax are having breakfast, Argentinean children are _____.

A. sleeping        

B. going home      

C. at school      

D. having supper

3. It's midday in the capital of _____ when it's 9:00 a.m. in the capital of Argentina.

A. Japan          

B. Canada        

C. New Zealand    

D. Scotland

4. Two p.m. in Egypt is not a good time to telephone people in New Zealand, because in New

Zealand _____.

A. it's midnight and most people are asleep  

B. it's noon and many people are having lunch

C. it's the morning and many people are working

D. it's the afternoon and most people are playing computer games

5. What time is it in New Zealand if it's 11:15 p.m. in Japan?

A. 1:15 p.m.      

B. 2:15 p.m.      

C. 1:15 a.m.        

D. 2:15 a.m.