Migration in the main economic reasons,such as poverty and unemployment,improve their lives,or to become rich,to seek success and so on.In addition,political,religious,cultural,and war and famine may lead to migration.Direct consequence of the performance of migration in the move out,move into the number of population,gender and age composition of the different effects.Immigrants in general more men than women,young children and the elderly population than migration.From indirect economic and social consequences of view,the move to reduce the population pressure and may be migrants remittances,but the workforce reduction,especially those with high educational level and skilled labor to move out,so move out to the upbringing,education costs are great losses.Of moving regions,due to increased population and labor force,economic benefit,but may also bring ethnic conflicts or other social problems.
最新问答： 能动英语怎么样 美国研究人员发现了一种含有集光绿色体的喜氧罕见细菌，每个集光绿色体含有大量叶绿素，使得细菌能够同其他生物争夺阳光，维持生 这是吉姆的全家的英文怎么写?现在就要啊, 将pH=1的硫酸150ml平均分成3份,一份加水到500ml,此时盐酸的pH值是, 辅音+元音的连读,为什么 take a back seat 也是?等等还有take advantage of 也是 有一批图书,按3比4比5分配给三、四、五年级.三、四、五年级各分到图书总数几分之几 甲乙两辆汔车同时从A地开往B地,当甲车行了全程的三分之一时,乙车正好行了60千米,当甲车到达B地时,乙车行了全程的五分之 电源的电动势E=2V,与R=5Ω的负载的电阻连接成闭合电路,测得电源两段的电压为1.8V,求电源的内阻r 傲慢与偏见读后感急求《傲慢与偏见》的读书报告，英文版，字数100左右，要求内容简单 五年级上册小数除法练习题!跪求````````` 求一个字母V开头的单词要求1、形容词性2、有贬义..3、最高级最好能加MostP：记得上次看见过这个单词...好象是类似 如图，⊙O是四边形ABCD的内切圆.若∠AOB=70°，则∠COD=（ ） 函数y=e的x绝对值次方是A.奇函数,且在区间0和正无穷大内单调增加.B.偶函数,且在区间负无穷大和0内单调增加.C.偶 细菌呼吸场所 将多项式x2-3x-4分解因式，结果是（ ） （2012•宁德模拟）已知函数f（x）=2x+k•2-x，k∈R． 关于地形对气候影响的叙述，正确的是 [ ] A．阿尔卑斯山脉大致呈东西向 钢板截面-750×20是什么意思 郦道元的三峡第一段中两个 自 的意思一样吗? 抛物线y=-x2-2x+m，若其顶点在x轴上，则m=______．
