A:it
B:which
C:thi
D:that
我们青少年学生关心社会,更重要的是要( )
鱼不停地用口吞水,再从鳃孔排水,其意义是( )
根据对话内容,选择合适的句子填空
Sam: Who are they,lingling?
Lingling: ____.
Sam: ____?
Lingling: It's my grandma.
Amy: ____.
Lingling: ____?
Amy: Did she learn any foreign languages?