3、ndonacherishedbelief,andtheearlieradecisionhasbeentaken,theharderitistoabandonit.Drugcompaniesmustdecideearlytocancelafailingresearchprojecttowastemoney,butfinditdifficulttoadmittheyhavemadeamistake.inthesameway...这段话的首句就是主题句。在同一篇文章当中,首句是主题句的就有四段话。大家可以把那套考题拿出来总结分析一下。 b