49. What step is essential to the traditional production of flu vaccine?

7.The educational expert’s speech ________ a new round of consultation from parents about children’s domestic education.

51. The author’s attitude towards divorce may best be described as “______”.

二、多项选择题1.中国传统的色彩观称为“五色观”，其中的“五色”包括（）等。

33.

27.

15.At the end of the historic area, Wilmington displayed its _______ as a working port city: large ware-houses and a few other dated office buildings.

52. It can be inferred that the author is most probably ________.

32.

3.We work to make money, but it’s a ________ that people who work hard and long often do not make the most money.

14. Scholars from the University of Kansas published the results of a decade-long study recently, suggesting that sending children to “pre-school” at the age of 4 comes too late to ________ educational drawbacks at home.

23.