单项选择题
A.年轻人养成吸烟习惯将会对他们造成很大的影响。 B.年轻人吸烟的严重后果应该努力去克服。 C.使年轻人明白吸烟带来的危害应该被付出极大的努力。 D.(我们)应该尽最大努力告诫年轻人吸烟的危害性。
A.called their friends to tell them what had happened B.had great fun even if they knew the tsunami had come C.knew nothing about the tsunami until their friends rang them up D.turned out calm in face of the tsunami
A.unsuitable B.not enough C.unnecessary D.irregular