2.D
3.C
4.( 1) It is far away from the big cities with convenient transportation, some of which reach 200-300 miles, and even the nearest one is nearly half the distance.
(2) Set up other private schools in Shihua and Xiangxi to educate the Chen family.
(3) Zhang Jun's descendants should always take it as their responsibility to inherit (Zhang Jun's) ambition (to manage Yi Shu well), instead of focusing on their own wealth and selfishness.