就赫罗图分析,宇宙中的大部分恒星的演化到了( )
A:幼年期
B:青壮年期
C:晚年期
D:衰亡期
-- Li Ming said he would come here, _______ he hasn't arrived.
-- Don't worry. He is on the way. ______, there is much traffic, so it will take more time.
根据要求改写句子。