【简答题】若x 2 +2x的值是6,则5-3x 2 -6x的值是______.
【单选题】若分式 1 5-x 有意义,则x的取值范围是( )
【多选题】在俄罗斯,主人请客人吃( )是最殷勤的招待。
【单选题】Generally, it takes courage for an aged person ______ a new life in a strange country.
【简答题】若使代数式 x 5 -5的值不大于 x 2 -2的值,则x的取值范围是______.
【单选题】The period before the American Civil War is generally referred to as ______.
【简答题】Generally speaking, when ____ according to the directions, the drug has no side effect. taking B. taken C. to take D. to be taken