Questions : See the graphs on the fol.-lowing page for information to answer the questions.
Adult education participation rates in the past 12 months: 1991 and 1995

Bob and Jack share an apartment. If each month Bob pays a dollars and Jack pays b dollars, what percent of the total cost does Bob pay（）

A．The author cites an authority supporting a previous statement and then qualifies the original statement to clarify its implications.
B．The author makes a point, quotes an observation apparently contradicting that point, and then resolves the inconsistency by limiting the application of his original statement.
C．The author makes a negative comment and then modifies it by rephrasing his original comment to eliminate its negative connotations.
D．The author summarizes an argument, quotes an observation in support of that argument, and then advances an alternative hypothesis to explain potential contra- dictions in that argument.
E．The author states a thesis, quotes a statement relevant to that thesis, and then presents two cases, both of which corroborate the point of the original statement.

A. a preoccupation with style over design practicality
B. the inefficiencies of installing plantings to a building’s roof
C. how green roofs lead to more efficient and less-stressed home systems
D. the increased public interest in environmental friendliness in the construction industry
E. how global warming has accelerated society’s interest in environmentally friendly structures