张骞出使西域后,丝绸之路渐趋形成。该商路的起点是( )
A:洛阳
B:长安
C:敦煌
D:疏勒
羞耻之心是自觉抵制诱惑的一种精神力量。( )
I don't understand the text there are few new words in it.