31.  Although in 1990, it cuts down to 100 deaths per 1,000 births.What are the reasons for these changes?Firstly, the economic development is the most important reason.

32.  But I think them as the important reasons for the changs of the life expectancy and the infant mortality.

33.  Then, the peace of the world is also an important reasons .In a word, health gains in developing countries has made a great progress.

34.  The important reason is that the medicine developed very much.

35.  The most important reason is the development of technology.

36.  The most important reason why fake commodities are so many is that the consumers who are damaged are indeference .

37.  Besides, another important reason is that he is kind to persons especially his students.

38.  But those are not the most important reasons, in fact, the charm from external characters could not last a long time .

39.  And the most important reason that make our school a key school is all the teachers are excellent, be strict with their students.

40.  The most important reason that they found out other people can't see is that they have intense interest and extraordinary observations Galileo was was just such a person.