成套接地线应用由有（）的多股软铜线组成，其截面不得小于（）mm2，同时应满足装设地点

下列各组离子一定能大量共存的是 [ ]

A．含有大量Fe³⁺的溶液中：NH₄⁺、Na⁺、Cl^-、SCN^-

B．在强碱溶液中：Na⁺、K⁺、AlO₂^-、CO₃^2-

C．在pH=7的溶液中：NH₄⁺、Al³⁺、SO₄^2-、NO₃^-

D．c（OH^-）= 10^-13 mol/L的溶液中：K⁺、Fe²⁺、Cl^-、NO₃^-

1997年10月，W省G市（设区市）A县B国有企业，委托C房地产开发公司，为本企业职工，在A县县城内建成春都住宅小区。该小区建多层住宅8栋，3万m²；高层住宅一栋1.2万m²。2008年2月，通过房改，将该小区所有住宅出售给职工，其中，多层住宅售房款为4500万元，高层住宅售房款为2400万元。B国有企业职工王某以当地政府确定的成本价750元／m²，购买了自己租住的建筑面积海70m²的该小区住房。公房出售后，B国有企业及其购房职工，分别按规定提取并交纳了住宅专项维修资金。2011年3月，该小区召开了业主大会，成立了业主委员会，并聘用二级资质D物业服务公司，进行小区物业管理。

B国有企业职工王某购买自己租住的该小区住房，按照最新政策规定，王某应交纳住宅专项维修资金（）元。

A.600

B.900

C.1050

D.1200

在中共一大上，谁缺席却仍然被推选为中央局书记[      ]

A、鲁迅

B、李大钊

C、毛 * *

D、陈独秀

Motherhood may make women smarter and may help prevent dementia（痴呆） in old age by bathing the brain in protective hormones（荷尔蒙） , U．S．researchers reported on Thursday．

Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer’s（早老痴呆症）．University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans．“Our research shows that the hormones of pregnancy（怀孕） are protecting the brain, including estrogen（雌激素）, which we know has many neuroprotective （保护神经的） effects,” Kinsley said．

“It’s rat data but humans are mammals just like these animals are mammals,” he added in a telephone interview．“They go through pregnancy and hormonal changes．” Kinsley said he hoped public health officials and researchers will look to see if having had children protects a woman from Alzheimer’s and other forms of age-related brain decline．

“When people think about pregnancy, they think about what happens to babies and the mother from the neck down,” said Kinsley, who presented his findings to the annual meeting of the Society of Neuroscience in Orlando, Florida．

“They do not realize that hormones are washing on the brain．If you look at female animals that have never gone through pregnancy, they act differently toward young．But if she goes through pregnancy, she will sacrifice her life for her infant—that is a great change in her behavior that showed in genetic alterations（改变） to the brain．”

小题1:How do scientists know “Motherhood may make women smarter”?

A．Some researchers have told them．

B．Many women say so．

C．They know it by experimenting on rats．

D．They know it through their own experience．小题2:What does the phrase “litters of pups” mean in the second paragraph?

A．Baby rats．

B．Animals．

C．Old rats．

D．Grown-up rats．小题3:What can protect the brain of a woman according to the passage?

A．Estrogen．

B．The hormones of pregnancy．

C．More exercise．

D．Taking care of children．小题4:“It’s rat data but humans are mammals just like these animals are mammals．” What does the sentence suggest?

A．The experiments on the rats have nothing to do with humans．

B．The experiments on the rats are very important for animals．

C．The experiments on the rats are much the same on humans．

D．The experiments on the rats are much the same on other animals．小题5:Which title is the best for this passage?

A．Do You Want to Be Smarter?

B．Motherhood Makes Women Smarter

C．Mysterious Hormones

D．An Important Study

人生最宝贵的是时间，时间是人生最初也是最重要的财富。下列表述中能说明该观点的是[ ]

①时间就是金钱

②时间就是生命

③时间就是效益

④人类是时间的仆人

A、①④

B、②④

C、①②③

D、①②③④