The book provides a concise analysis of the country's history.()

单项选择题Enormous sums of money have been spent on space exploration.

单项选择题The great change of the city astonished all the visitors．

单项选择题Even sensible men do absurd things().

A. unusual
B. ridiculous
C. special
D. typical

单项选择题She was a puzzle.()

A. girl
B. woman
C. mystery
D. problem

单项选择题The governor gave a rather determined explanation to the public().

A. unclear
B. firm
C. short
D. vague