市场领导者通常采取的竞争性营销战略是（）。 A．扩大市场需求总量 B．扩大市场份额

建设单位对一项目进行公开招标，招标文件于2008年4月6日开始出售，招标文件上规定，从2008年4月20日开始接收投标文件，截止日期为2008年6月18日，建设单位对甲、乙、丙、丁四家施工单位进行了资格审查，其中丙单位未达到资格审查的最低条件。招标文件发出后，招标人要对招标文件进行修改。

在原投标有效期结束前，出现特殊情况的，招标人可以以书面形式通知所有投标人( )。

A．延长时间

B．延长保证金的有效期

C．延长中标有效期

D．延长投标有效期

下列变化中，属于物理变化的是（　　）

A．

氧气使带火星的木条复燃

B．

水受热蒸发

C．

液体混合产生气体

D．

白色粉末变成蓝色晶体

行政性收费由国家物价局立项，核定标准并进行管理。( )

In the following passage, there are 20 blanks representing the words that are missing from the context. You are to put back in each of the blanks the missing word． The time for this section is 20 minutes.
Where do you really come from And how did you get (1) where you live today DNA studies suggest that all humans today (2) from a group of African ancestors who—about 60,000 years ago— (3) a remarkable journey.
The Genographic Project is seeking to chart new (4) about the migratory history of the human species by (5) sophisticated laboratory and computer analysis of DNA contributed by hundreds of (6) of people from around the world． In this unprecedented and real-time (7) effort, the Genographic Project is closing the gaps of what science (8) today about mankind’s ancient migration stories.
The Genographic Project is a five-year (9) partnership led by National Geographic Explorer-in-Residence Dr. Spencer Wells. Dr. (10) and a team of renowned international scientists and IBM researchers, are (11) cutting-edge genetic and computational technologies to analyze historical patterns in DNA (12) participants around the world to better understand our human genetic roots. (13) three components of the project are: to gather field research data (14) collaboration with indigenous and traditional peoples around the world; to invite (15) general public to join the project by purchasing a Genographic Project Public Participation Kit; (16) to use proceeds from Genographic Public Participation Kit sales to further (17) research and the Genographic Legacy Fund which in (18) supports indigenous conservation and revitalization projects. The Project is anonymous, non-medical, (19) , non-profit and non-commercial and all results will be placed in the (20) domain following scientific peer publication.

厚煤层：是指厚度在（）以上的煤层。

A、3.5米

B、4.5米

C、5.0米