陕西省2021研究生考试报名时间公布了吗

如果品学兼优,就能获得奖学金。假设以下哪项,能依据上述断定得出结论:李桐学习欠优?

A.李桐品行优秀,但未获得奖学全
B.李桐品行优秀,并且获得了奖学金
C.李桐品行欠优,未获得奖学金
D.李桐品行欠优,但获得奖学金
E.李桐并非品学兼优

已知总体方差为100，样本容量为50，那么样本标准差分布的标准差为

A.1
B.2
C.1.4
D.0.5

Text 2 A century ago,the immigrants from across the Atlantic included settlers and sojourners.Along with the many folks looking to make a permanent home in the United States came those who had no intention to stay,and 7million people arrived while about 2 million departed.About a quarter of all Italian immigrants,for example,eventually returned to Italy for good.They even had an affectionate nickname,“uccelli di passaggio,”birds of passage.Today,we are much more rigid about immigrants.We divide newcomers into two categories:legal or illegal,good or bad.We hail them as Americans in the making,or brand them as aliens to be kicked out.That framework has contributed mightily to our broken immigration system and the long political paralysis over how to fix it.We don't need more categories,but we need to change the way we think about categories.We need to look beyond strict definitions of legal and illegal.To start,we can recognize the new birds of passage,those living and thriving in the gray areas.We might then begin to solve our immigration challenges.Crop pickers,violinists,construction workers,entrepreneurs,engineers,home healthcare aides and physicists are among today's birds of passage.They are energetic participants in a global economy driven by the flow of work,money and ideas.They prefer to come and go as opportunity calls them.They can manage to have a job in one place and a family in another.With or without permission,they straddle laws,jurisdictions and identities with ease.We need them to imagine the United States as a place where they can be productive for a while without committing themselves to staying forever.We need them to feel that home can be both here and there and that they can belong to two nations honorably.Accommodating this new world of people in motion will require new attitudes on both sides of the immigration battle.Looking beyond the culture war logic of right or wrong means opening up the middle ground and understanding that managing immigration today requires multiple paths and multiple outcomes,including some that are not easy to accomplish legally in the existing system.
The author suggests that the birds of passage today should be treated____

A.as faithful partners
B.with economic favors
C.with legal tolerance
D.as mighty rivals

火与热的主要区别是（　　）
A.火为热之极，热极能化火
B.火为内生，热为外受
C.火多脏腑郁发或邪郁化火，其性炎上；热多泛及全身
D.火易耗血动血，热易易耗伤阴液