下列化合物中阳离子和阴离子电子层结构相同的是
A.NaCl B.MgF2 C.CaF2 D.K2O
下列有关实验原理或操作正确的是( )
A.实验室将硫酸铜溶液直接加热蒸发至干方法来制取CuSO4•5H2O
B.用湿润的pH试纸来检验溶液的pH值
C.用KSCN溶液检验硫酸亚铁溶液是否氧化变质
D.用四氯化碳萃取溴的苯溶液中的溴
下列类比关系正确的是
A.少量碳酸钠溶液与酷酸反应:2CH3COOH+CO32-=2CH3COO-+CO2↑+H2O,则与次氧酸反应也生成CO2(HC10 Ka=2.98×10-8 H2CO3 K1=4.3×10-7 K2=5.6×10-11
B.Fe2O3与盐酸反应生成FeCl3,则与氢碘酸反应也可生成FeI3
C.FeCl3加热蒸干、灼烧得Fe2O3,则FeCl2加热蒸干、灼烧得FeO
D.Al与Fe2O3能发生铝热反应,则与MnO2也能发生铝热反应
利用物理因素或化学因素处理某种生物,基因A突变为基因a,下列有关叙述不正确的是
A.碱基类似物通过改变核酸的碱基使基因A突变为基因a
B.基因A突变为基因a,两者的碱基对数目可能不同
C.与基因A比较,基因a的结构不一定改变
D.用紫外线再次处理该生物,基因a不一定突变为基因A
著名经济学家特里芬讲过一个“媳妇煮粥”的故事:从前有个媳妇,贤淑能干。后来婆婆让她主持家务,负责给全家人煮粥。由于每年打的粮食很有限,然而这一家却年年添丁进口,为了让全家人都吃饱,媳妇只好不断往锅里加水,结果是粥越来越稀。最后,婆婆怀疑媳妇把米偷着背回了娘家,一气之下,将她赶出了家门。据所学知识判断,与故事相吻合的是( )
A.经济区域集团化的趋势 B.布雷顿森林体系的崩溃
C.大国强权政治色彩的体现 D.国家垄断资本主义的产生
If you know exactly what you want, the best way to get a job is to get specialized training. A recent report shows that companies like graduates in such fields as business and health care who can go to work immediately with very little on-the-job training.
That’s especially true of booming fields that are challenging for workers. At Cornell's School of Hotel Administration, for example, bachelor's degree graduates get an average of four or five job offers with salaries ranging from the high teens to the low 20s and plenty of chances for rapid advancement. Large companies especially like a background of formal education coupled with work experience. But in the long run, too much specialization does not pay off. Business, which has been flooded with MBAs, no longer considers the degree an automatic stamp of approval. The MBA may open doors and command a higher salary initially, but the impact of a degree washes out after five years.
As further evidence of the erosion of corporate faith in specialized degrees, Michigan State’s Scheetz cites a pattern in corporate hiring practices. Although companies tend to take on specialists as new hires, they often seek out generalists for middle and upper-level management. This sounds like a formal statement that you approve of the liberal-arts(文科) graduate. Time and again labor-market analysts mention a need for talents that liberal-arts majors are assumed to have: writing and communication skills, organizational skills, open-mindedness and adaptability, and the ability to analyze and solve problems. David Birch, manager of the Boston Red Sox, says that he does not hire anybody with an MBA or an engineering degree. “I hire only liberal-arts people because they have a less-than-canned way of doing things,” says Birch.
For a liberal – arts degree, students focus on some basic courses that include literature history, mathematics, economics, science, human behavior and a computer course or two. With these useful and important courses, you can feel free to specialize, “A liberal-arts degree coupled with an MBA or some other technical training is a very good combination in the marketplace,” says Scheetz.
1.The job market is in great need of people with .
A.special training in special fields
B.a bachelor’s degree in education
C.formal schooling and work experience
D.an MBA degree from top universities
2.The underlined sentence in Paragraph 2 means .
A.an MBA degree does not help in future promotion
B.MBA programs will not be as popular as they are now
C.people will not forget the degree the MBA graduates have got
D.most MBA programs fail to provide students with a foundation
3.David Birch says that he only hires liberal – arts people because .
A.they will follow others’ ways of solving problems
B.they can do better in bundling changing situations
C.they are well trained in a variety of specialized fields
D.they have attended special programs in management
4.The author supports the idea that .
A.on – the – job training is less costly in the long run
B.formal schooling is less important than job training
C.specialists are more expensive to hire than generalists
D.generalists will do better than specialists in management
下列所示装置正确且能完成相关实验的是
A.用甲所示装且制取Fe(OH)2 B.用乙所示装置制取SO2
C.用丙所示装置制取O2 D.用丁所示装置比较Cl、C、Si的非金属性强弱
“科学家是天生好奇的人,他们试图去发现许多观察结果之间的内在联系。科学家是有耐性的人,因为自然界在缓慢的展示着它的奥秘。科学家是认真仔细的人,他们必须经常验证他们的结论,他们十分清楚:科学的解释不可能达到完美的程度,他们常常是暂时的。”科学家具有天生好奇的品质,这种优秀的品质表现为( )
①善于透过现象认识事物的本质
②善于从事物的个性中发现共性
③善于创造事物之间的本质联系
④善于认识和利用事物的内在联系
A.①②③ B.①②④ C.②③④ D.①③④
7.下列过程未体现生物膜信息传递功能的是
A.蔗糖溶液使洋葱表皮细胞发生质壁分离
B.抗原刺激引发记忆细胞增殖分化
C.胰岛素调节靶细胞对葡萄糖的摄取
D.传出神经细胞兴奋引起肌肉收缩
有人认为:“民主的雅典最后还是败于专制的斯巴达,亡于独裁的马其顿帝国。”这表明古代希腊
A.实行的直接民主过于广泛 B.民主制度不适合于古代
C.民主政治存在明显的弊端 D.民主政治最终仍会胜利
— Amazing! You ________ come to the party in such a fancy dress(化装舞会所穿的服装).
— Don’t you know it’s a fashion? You’re out.
A. should B. will C. can D. must
猴的下列各组细胞中,肯定都有Y染色体的是
A.受精卵和次级精母细胞 B.精子和雄猴的上皮细胞
C.受精卵和初级精母细胞 D.初级精母细胞和雄猴的肌肉细胞
某家庭中,丈夫正常,妻子患有某种单基因遗传病,两个女儿正常。下列有关判断正确的是( )
A.该遗传病为隐性遗传病 B.致病基因位子X染色体上
C.两个女儿的基因型相同 D.两个女儿的基因型可能不同
将15.6 g Na2O2和5.4 g Al同时放入一定量的水中,充分反应后得到200 mL溶液,再向该溶液中缓慢通入标准状况下的HCl气体6. 72 L,若反应过程中溶液的体积保持不变,则下列说法正确的是
A.最终得到7.8g沉淀
B.标准状况下,反应过程中得到6.72L的气体
C.最终得到的溶液中只含NaCl溶质
D.最终得到的溶液中c(Na+)=1.5mol/L
有一质量为m的木块,从半径为r的圆弧曲面上的a点滑向b点,如图。如果由于摩擦使木块的运动速率保持不变,则以下叙述正确的是
A.木块所受的合外力为零;
B.木块所受的力都不对其做功;
C.木块所受的合外力不为零,但合外力对木块所做的功为零;
D.木块的机械能在减小。
下面这段文字的结论是从哪些方面推导出来的?请提取其主要原因,在横线上写出五个关键短语。(5分)
西昌卫星发射中心纬度低,海拔高,发射倾角好,地空距离短,在这里发射卫星,可以利用地球自转的离心力,又可缩短地面到卫星轨道的距离。同时坚实的地质结构,对地面发射设施设备、跟踪测量、通讯布网有利。这里,晴好天气多,几乎没有雾天,试验周期和允许发射的时间较多;交通通讯方便,为运输火箭、卫星和燃料提供保障。因此,西昌卫星发射中心发射场被称为“天然发射场”。
新宰的畜、禽,如果立即把肉做熟了吃,肉老而口味不好.过一段时间再煮,肉反而鲜嫩.这与肌细胞中哪一种细胞器的作用有关( )
A.核糖体 B.溶酶体 C.线粒体 D.中心体