钛(Ti)被称为继铁、铝之后的第三金属，钛白(TiO2)是目前最好的白色颜料。制备TiO2和Ti的原料是钛铁矿，我国的钛铁矿储量居世界首位。用含有Fe2O3的钛铁矿（主要成分为
FeTiO3）制取TiO2的流程如下图所示
(1)Ti的原子序数为22，Ti位于元素周期表中第____ 周期，第____族。
(2)步骤①：加Fe的目的是____________； 步骤②：冷却的目的是________。
(3)上述制备TiO2的过程中，可以利用的副产物是_______，考虑成本和废物综合利用因素，废液中应加入______处理。
(1)四；ⅣB
(2)将Fe3+还原为Fe2+；析出（或分离、或得到）FeSO4
7H2O
(3) FeSO4
7H2O；石灰（或碳酸钙、废碱）
Passage Two
| The social sciences, as the name shows, are the scientific study of the behavior of human beings, both in groups and individually. There is no past or present information of human beings who were not in groups. The groups may be small, like the family, or large, like a city or nation. But in order to reach complete development, man must be a member of a society. It is true that some individuals are more solitary than others. Some, like monks or hermits, may decide, for religious or other reasons, to leave their society and live alone. But these are unusual individuals, and even they can not separate themselves completely from the rest of mankind. A society, then, seems to be the natural environment of mankind. Scholars who study mankind in social organizations are called social scientists. The human behavior which social scientists study is learned behavior. The behavior of the human body as a living organism is studied by the biologist, the biochemist, or the physician. This behavior of man’s physical body is inherited through the genetic development of his species. For example, all physical normal and healthy humans learn to walk as their bodies grow and develop. Social scientists concern themselves with the behavior that man must learn so that he can take his place in a social group. In order to be a functioning member of a group, each member must learn to behave in a way acceptable to other members of that group. The kind of behavior, which must be learned, differs according to the differences among societies. The social scientists are newcomers to academic studies. By the end of the nineteenth century, the natural sciences had developed a method, by which they were able to understand the physical world. By using the scientific method, chemists, physicists, and astronomers, for example, learned a great deal about the universe. It seemed reasonable to apply the same method to the study of man’s social life. Through this kind of study man may learn to understand himself much better. The scientific method is a way of collecting facts in order to describe an existing situation as correctly and completely as possible. The description must consist only of what can be perceived, analyzed, measured, and recorded. Feelings and personal opinions or ideas have no place in scientific description. The facts must be observed and described in such a way that another scientist could repeat the same study and get the same results. |
What does a social scientist study
A．The family.
B．Human beings as members of groups.
C．Nation.
D．Molecules and ions.