问题 填空题

根据所给英文提示用英语写出家庭成员的关系。

1. Mr. Green is Mrs. Green's ____________.

2. My father's father is my ____________.

3. My aunt's son is my ____________.

4. Your grandmother's son is your ____________ or your ____________.

5. Your cousin's father is your ____________.

6. Your aunt's sister is your ____________ or your ____________.

7. Your uncle's brother is your ____________ or your ____________.

8. My grandfather's daughter is my ____________ or my ____________.

答案

1. husband  2. grandfather  3. cousin  4. father, uncle  5. uncle  6. aunt, mother

7. father, uncle  8. mother, aunt

问答题

硫化钠和碳酸钠为原料、采用下述装置制备硫代硫酸钠,制备反应可表示为:

2Na2S+Na2CO3+4SO2=3Na2S2O3+CO2.根据要求回答问题:

(1)实验时,打开K1,关闭K2,最后洗气瓶中发生反应的离子方程式是______.

(2)锥形瓶内溶液pH小于7时会导致产品分解,因此实验过程中需要控制锥形瓶内溶液的pH.

①反应过程中,锥形瓶中溶液pH将______(填“增大”、“减小”或“保持不变”).

②测量锥形瓶中溶液pH时,用注射器吸取溶液样品比直接打开锥形瓶中瓶塞取样,除操作简便外,还具有的优点是______.

③若实验过程中测得溶液pH已接近于7.此时应该进行的操作是______.

(3)已知:2Na2 S2O3+I2=2NaI+Na2 S4O6.实验结束后进行相关处理,可即获得Na2 S2O3•5H2O晶体.为测量其纯度,取晶体样品mg,加水溶解后,滴入几滴淀粉溶液,用0.010mol/L碘水滴定到终点时,消耗碘水溶液vmL,则该样品纯度是______

(4)制取硫代硫酸钠的另一种方法是直接将硫粉和亚硫酸钠、水混合共热制取.为探究制取硫代硫酸钠最佳条件(溶液pH、亚硫酸钠浓度、反应温度、硫粉质量),设计如下对比实验(每次实验时亚硫酸钠质量均为63g,反应时间为30min):

实验序号溶液pH亚硫酸钠与水的质量比反应温度硫粉质量亚硫酸钠转化率
1101.5:11001880.7%
2a1.1:11001894.6%
①实验1、2的目的是探究亚硫酸钠浓度对亚硫酸钠转化率的影响,则a=______

②若还要探究溶液pH、反应温度、硫粉质量对亚硫酸钠转化率的影响,除实验1、2外,至少还需进行______次对比实验.

③实验表明:亚硫酸钠转化率不受硫粉质量多少的影响.为什么?答:______.

单项选择题

Education is one of the key words of our time. A man, without an education, many of us believe, is an unfortunate victim of unfortunate circumstances deprived of one of the greatest twentieth-century opportunities. Convinced of the importance of education, modern states "invest" in institutions of learning to get back "interest" in the form of a large group of enlightened young men and women who are potential leaders. Education, with its cycles of instruction so carefully worked out, is punctuated by textbooks--those purchasable wells of wisdom--what would civilization be like without its benefits

So much is certain: that we would have doctors and preachers, lawyers and defendants, marriages and births; but our spiritual outlook would be different. We would lay less stress on "facts and figures" and more on a good memory, on applied psychology, and on the capacity of a man to get along with his fellow-citizens. If our educational system were fashioned after its bookless past we would have the most democratic form of "college" imaginable. Among the people whom we like to call savages all knowledge inherited by tradition is shared by all; it is taught to every member of the tribe so that in this respect everybody is equally equipped for life.

It is the ideal condition of the "equal start" which only our most progressive forms of modern education try to reach again. In primitive cultures the obligation to seek and to receive the traditional instruction is binding on all. There are no "illiterates"--if the term can be applied to peoples without a script--while our own compulsory school attendance became law in Germany in 1642, in France in 1806, and in England 1976, and is still non-existent in a number of "civilized" nations. This shows how long it was before we considered it necessary to make sure that all our children could share in the knowledge accumulated by the "happy few" during the past centuries. Education in the wilderness is not a matter of monetary means. All are entitled to an equal start. There is none of the hurry that, in our society, often hampers the full development of a growing personality. There, a child grows up under the ever-present attention of his parents; therefore the jungles and the savages know of no "juvenile delinquency". No necessity of making a living away from home results in neglect of children, and no father is confronted with his inability to "buy" an education for his child.

Notes: juvenile delinquency 青少年犯罪。

The best title for this text is()

A. The Significance of Education

B. Educational Investment and Its Profit

C. Education and Modern Civilization

D. Education: A Comparison of Its Past and Its Present