在队列研究中，调查对象应选择（）。A．在有该种疾病者中，选择_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

在队列研究中，调查对象应选择（）。

A．在有该种疾病者中，选择有、无某种暴露的两组人群

B．在有该种疾病者中，选择有某种暴露的为一组；在无该种疾病者中，选择无某种暴露的为另一组

C．在无该种疾病者中，选择有某种暴露的为一组；在有该种疾病者中，选择无某种暴露的为另一组

D．在无该种疾病者中，选择有、无某种暴露的各为一组

E．任选有、无暴露的两组人群

答案

参考答案：D

阅读理解

Ticket Types	Regulations	Notes
Single Day Admission	For all visitors On any standard Day other than Peak Day *One ticket per person, valid(有效的)for one entry on the day of admission	Standard Day tickets refer to the tickets for all visiting days(167 days in total) except for Peak Days during the Expo.
Special Admission	For the disabled For people born in or before 1950 For students with valid IDs For children above 1.2m For Chinese military personnel on active duty Valid IDs are required upon ticket purchase and entry On any Standard Day other than Peak Day One ticket per person, valid for one entry on the day of admission
3 Day Admission	For all visitors Valid for any three days except Peak Days *One ticket per person, valid for one entry per day	The tickets are designed to meet the multi-entry demand of visitors.
7 Day Admission	* For all visitors Valid for any seven days except Peak Days One ticket per person, valid for one entry per day

小题1: _______ can get a Special Admission ticket for himself/ herself.

A．A 56-year-old bus driver	B．A school girl with her valid student card
C．A policeman in his forties	D．A U.S. army officer on active duty

小题2:If you want to enter the Expo Park once every week in one month and don’t want to bother to buy the ticket each time, you can buy a ______ ticket.

A．Single Day Admission	B．Special Admission
C．3 Day Admission	D．7 Day Admission

小题3:The function of the table is to ______ .

A．remind the public of the difficulty buying the Expo tickets

B．show which groups of people can get admission into the Expo Park

C．provide information about the Expo tickets and regulations

D．introduce all the visiting regulations in the Expo Park

单项选择题

二、根据下面的表格资料回答以下问题

2003年至2007年全国大中型工业企业科技指标情况表

	单位	2003年	2004年	2005年	2006年	2007年
企业总数	个	22276	21776	22904	23096	222.76
设有科技机构企业的比重	%	32	28.4	26.2	25.3	24.9
科技人员	万人	156.4	138.7	136.8	136.7	141.1
科技人员占做从业人员的比例	%	4.6	4.78	4.88	5	4.5
科技经费	亿元	665.4	922.81	1046.65	1213.03	1588.61
科技经费占销售额的比例	%	1.35	1.65	1.67	1.73	1.65

2007年全国大中型工业企业的销售额约为( )。

A．96279亿元

B．80241亿元

C．10375亿元

D．10026亿元