我国55个少数民族中，有22个少数民族的人口在10万人以下，总人口60多万人，统称“人口较少民族”。近些年来，国家扶持人口较少民族发展，政策力度之大、投入资金之多、覆盖范围之广，在人口较少民族发展史上是前所未有的。这体现了( )
A．我国实行民族区域自治制度
B．我国坚持各民族共同繁荣的原则
C．民族团结是民族平等的政治基础
D．各民族在社会地位上实现了平等
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| 选出下列每组中不同类的单词。 | |||
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下列实验方案中，正确的是
A．制备NaOH溶液：将饱和的Na2CO3溶液与适量的石灰水混合后过滤
B．检验碳酸根离子：将要检验的物质与稀盐酸混合，观察是否产生气泡
C．证明NaOH和盐酸恰好完全反应：在反应后的溶液中加入酚酞溶液
D．验证质量守恒定律：用NH4Cl溶液与NaOH溶液混合加热，比较反应前后溶液的质量
女，35岁，发现前纵隔囊实性肿块，增强后明显强化，与大血管之间的脂肪层消失，右前胸膜不规则增厚，后肋膈角胸膜可见结节，右侧少量胸水，最可能的诊断是()
A．恶性胸骨后甲状腺肿
B．霍奇金病
C．侵袭性胸腺瘤
D．恶性皮样囊肿
E．纵隔型肺癌
下列（）的主要作用是保水蓄水的孔隙
A.非毛管孔隙
B.通气孔隙
C.毛管孔隙
D.无效孔隙度
Motherhood may make women smarter and may help prevent dementia in old age by bathing the brain in protective hormones, US reseachers 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. University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans.
"Our research shows that the hormones of pregnancy are protecting the brain, including estrogen, which we know has many neuroprotective 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 who 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 to the brain. \
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