填空题将their改为its。

单项选择题Special words used in technical discussion ______.[A] never last long [C] should be confined to scientific fields[B] are considered artificial language speech [D] may become part of common speech

填空题将good改为poor或bad。

单项选择题A．the chairman of Democratic National CommitteeB．the chairman of Republican National CommitteeC．the spokesman of Democratic National CommitteeD．the spokesman of Republican National Committee

填空题将relative改为relatively。