31. Because an older horse is more ______ than a younger one, it is safer for a novice rider.
A. frolicsome
B. cantankerous
C. gargantuan
D. tractable
E. precipitate
32. The library's collection is a ______ of Asian American historical documents, including rare materials about race relations.
A. summary
B. fabrication
C. consensus
D. trove
E. replication