【简答题】简述Ferguson提出的脊柱三柱概念。
【单选题】He said that it going to rain. [ ]
【单选题】What does the ________ say? Is it going to rain?
【单选题】下列蔬菜育苗过程中需要采取保护根系措施的有
【单选题】“Is it going to rain?” “I am afraid _____.”
【单选题】--- Is it going to rain tomorrow? --- I’m afraid _______.