【单选题】下面关于金属钠的描述正确的是 ( )
A.
钠的化学性质很活泼,在自然界里能以游离态存在
C.
钠能把钛 、 锆等金属从它们的盐溶液中还原出来
【单选题】The shop assistant didn't give me the right______.
【简答题】A.She isn't there in the morning. B.Her assistant isn't there in the morning. C.She won't have the forms he needs until the afternoon. D.She isn't as busy in the afternoon.
【简答题】A.She isn't as busy in the afternoon. B.She isn't there in the morning. C.Her assistant isn't there in the morning. D.She won't have the forms he needs until the afternoon.