题目

Should you have enough energy left after a day on the slopes, you can take a dip in the pool, ______ at the gym or go dancing in one of the city’s hotels and clubs. A．go out      B．run out     C．work out D．turn out 答案：C水和无机盐可以进入细胞，而有害的物质不能进入细胞，这主要（ ）A．细胞膜的全开放性 B．细胞壁的保护作用C．细胞核的遗传作用 D．细胞膜有控制物质进出细胞的作用