The solution of all difficulties, and the supply of all defects, must be sought in the examples, subjoined to the various senses of each word, and ranged according to the time of their authors. when first i collected these authorities, i was desirous that every quotation should be useful to some other end than the illustration of a word; i therefore extracted from philosophers principles of science; from historians remarkable facts; from chemists complete processes; from divines striking exhortations; and from poets beautiful descriptions.
a. the excerpt suggests that johnson’s work is significant because it reflects considerable literary research.
b. includes colorful drawings and illustrations.
c. is used by authorities in many fields of study.
d. explains many scientific principles.

b

explanation:

in the 1890s, southern states enacted a new form of black codes, called “jim crow” laws. these laws made it illegal for blacks and whites to share public facilities. this meant that blacks and whites had to use separate schools, hospitals, libraries, restaurants, hotels, bathrooms, and drinking fountains.

explanation:

the book's theme is the moral ambiguity of the iranian revolution, history of middle eastern relations and the process of growing up during war. it sheds light on the stereotypical views of middle eastern culture and religion.

the author explicitly portrays the issues of class disparities and racism continously throught the whole novel.

the relationship between parents and childrens, the abandonment of faith, modernity vs fundamentalism and class conflict are the 4 main panels that this novel englobes.

hope this , if you would like me to be more specific about a specific excerpt let me know : )